It might not be "instant" but it does post within 30 seconds at the most when I place at MtGox. Even an hour later my order I placed with you wasn't on Mtgox, so basically you offer market orders only. That makes your service useless to anyone looking to get a decent price instead of just taking what the market offers. At the very least you should not deceptively allow limit orders that will never be posted.
Also, you don't post the order if I place it using the "exchange" account either. In theory I am only trying to sell MY coin in that account, so your excuse about needing to charge interest even if the order is not executed is invalid.
I won't be using your service any further until you come up with a solution. The .5-1% I lose from being forced to buy at market is significantly more than anything I might save in fees.
Hi Thaddeus,
I understand perfectly this issue and am sorry if you thought we placed your orders on mtgox orderbook. It is still a limit order because it won't be executed are less than your set price, but yes it is not on mtgox orderbook and thus you miss some liquidity.
The problem is not so much to place your order on mtgox than to know what happens of it (when and at which prices is is executed). AFAIK mtgox doens't provide order history, only trades history (all the trades that happened no matter the order). We can only know if the order is still open or not.
This is why it is difficult to place your order on mtgox orderbook. We could do some guess work (if your order is no longer open then it is executed), and that's maybe what I'll do but that must be properly done and tested, and I haven't had the time to do it yet.
Now I know you don't care, you just want it to work. Fair enough I understand, and you will know when hard limit orders like that are implemented.
Thank you for your comprehension and best regards,
Raphael
fascinating....
and there are more things planed for the lending feature 
