Don't mind him he's LA's suck puppet troll.
Well, I am not LA's sock puppet troll but I was in the first traunch of orders for the LA3M from Jack, and I have (had) a preorder with Jack for one of the first LA15M. I also have bought equipment (currently over 3 Th/s) from KNC, BFL, and Bitmain; and I have preorders with Black Arrow, BFL and AMT among others including a couple of outright scams I fell for early on (I just started this last year). I am far from a professional miner, but I do have a pretty good sense now of who is honest and who is scamming, who is overpromising and underpromising, etc. I have been ripped off enough to have learned.
FWIW, I have had an excellent experience with Jack/LA, but like everything in life communication is key.
Jack originally posted a "ship by" date for the LA3M (I don't recall the exact date). Having been ripped off enough to be wary, I skyped with Jack and asked him what the absolute outside date was after which he would refund my money if not shipped. He named a date one week after the target date he had posted. He shipped about 3 days after the posted target date, well within the outside date. Had I not asked him for an outside date, maybe I would have been upset by the 3 day delay but even that is much better than delays experienced by other manufacturers even very reliable ones like Bitmain (who for reference I view as a 9.8/10). The LA3M performed exactly as Jack had said it would once I moved to an rPi controller (see below) - and it is worth noting that since Jack was one of the first (maybe the very first) to sell the 5 chip gridseed miners, many people accused him of being a scammer back then, saying a scrypt miner was impossible and a dual BTC/scrypt miner a fantasy (just read the initial posts in this thread for a laugh).
When I accidentally fried one of my gridseeds by reversing the polarity of the voltage (snap crackle and pop, literally), Jack offered to fix it for free even though it was clearly my fault (okay, they really should have diode protection so maybe not 100% my fault, but 99%). Jack is **always** available on Skype during the business day in China (for those who may not realize it, that means late night U.S. time) and he **always** responds to my Skype questions with detailed information and responses when he is online.
ROI on the LA3M was always iffy at the initial offering price, but I project it will break even in another 2 months (I use multipool and occassionally I switch over to dual mining, but mostly scrypt only). The initial offering price was never a bargain - it was (as Jack advertised it) brand new (Jack even labelled it initially as untested beta product for developers) technology for those of us who wanted to explore ASIC scrypt mining in the vanguard. At the current prices of as low as $1000 for 10, the 5 chips gridseeds will easily ROI (I now have 50 of them).
There have been disappointments, but not with Jack. The LA3M custom firmware was made proprietary, which (aside from likely violating several GPL licenses) made it impossible for me to tweak and fix problems/bugs in the first firmware version. V3 of the firmware was over a month late, and ultimately removed dual mining which I use. As it turns out, and as is always the case, open source versions of cgminer came out that are much better than the proprietary LA firmware, and now I run on an rPi with zero complaints about the hardware. All in all, for a first gen product that was delivered long before anyone else got their hands on the gridseed (at least to my knowledge), LA did a very good (but not perfect job) IMHO.
On the LA15M, Jack gave preorders price protection relative to the LA3M pricing. Before Jack went to the 60M, he confirmed to me that I would get refunded for more than half of the LA15M preorder price based on current LA3M pricing. When the LA3M pricing got so low that a 15M unit seemed silly even at $5,000, Jack agreed and found a 60M solution. He has offered to refund my preorder or carry it over to the LA60M -- I am still undecided on that. As an aside, if anyone wants to go 50/50 with me on the LA60M, please PM me. I don't want to manage a group, but I would be willing split an LA60M with one person and I would not be seeking anything other than 50% of actual purchase price and prorated hosting costs (I have a full rack, with half a rack of available space, in a dedicated hosting facility in the Chicago suburbs). I can provide personal identity and more details if you are seriously interested please PM me.
In sum, Jack has met every commitment he made. He never once tried to weasle out of the price protection or preorder cancellation terms that he promised, and (as he had promised me) when the LA15M became infeasible, he offered a refund of my preorder. He is always available on Skype during Chinese business hours and is very responsive there (not as responsive on PM though). I know there have been a few people whose orders got messed up, but that always happens and an occasional mistake or error is not the same as a missed commitment in my book. The problems with the proprietary LA firmware are the most serious issues with LA, but the mere fact that they have the resources and ability to produce such firmware (before anyone had another option, and before cgminer had gridseed support) is impressive and indicative of their technical ability.
I won't commit to the LA60M until I can see that it will ROI and at 15,000 (or if someone splits the risk with me), with so much scrypt mining power coming on line soon, that is subject to a lot of uncertainty right now. If Jack can get his out 2-3 weeks before the competition, that may make all the difference in ROI terms. But regardless I trust Jack to keep his word, which is a lot more than I can say for almost every other manufacturer (Bitmain excepted, as they set the bar for excellence and even LA/Jack do not approach Bitmain).
Nicely done all. 
