(Yes, I realize this is an old thread, but someone else might come across it like I did, even if the OP has moved on.)
I just got a Tinkerboy ADB to USB adapter, which I'll say more about later. I don't have an Imate, so I can't compare them directly. However -- the Imate seems to be going for $100-$200 on eBay, vs. $37 (plus shipping) for the Tinkerboy; it's no longer made; and it's very bulky, compared to the Tinkerboy.