The hard thing about the noise for me is the screaming quality to it. Other air cooled asics have a clean-whitenoise sound that isn't that bothersome to me. The SP10 squeals/whistles at a high, oscillating pitch. I can't be in the same room as it for too long, and that is even at its lowest fan setting.
I'd put spacing between the units, (and ideally move air through that space somehow) I suggest not stacking them on each other. They do get very, very hot, particularly on the bottom.
Spondoolies has fast shipping... it took me about a week to get my SP10, and that was with a problem with bitpay that delayed it a couple of days.
If you have american outlets, be aware... the performance suffers on 110v outlets. If you are going that route, I suspect other mining manufacturers might be a better deal for you.
Also be aware that, in the past, spondoolies had a dramatic price cut when they had units in stock, as opposed to preorder. I was very disappointed to order a preorder one, have my order delayed a few days due to problems with bitpay, and just as it gets sorted out, Guy lowered the price of the SP10 by about 12%, while I had to pay full price.
The SP10 is a very well engineered miner, but it is for a very specific application: being in a hosted environment with high voltage plugs, where noise does not matter. If you are not deploying it in such a setting, I suggest only getting one right now, not multiples, to see if it meets your needs.
tzortz has four stacked, and hasn't reported any issues. There would be a small clearance between them due to the rubber feet (that are supplied in case you aren't rack-mounting them).
If they are stacked in a rack they won't actually be touching either, as the one above will sit on rails rather than the one below. The rails will create a small gap between them.
@spond: is it necessary to put gaps between when stacking multiple SP10s in a rack?
