Depends on the price really, because I was looking at SHM's MAFterburner, which is already available for $300 ($360 for the plus model) and it's already dyno proven. Check out what it did for a Focus ZX3:
Replying to Topic 'Predator ECU flashing tool interest poll'
This item works similar to the APExi by fooling the ECU. A little cheaper, yes, and they already have experience with the 3.0L Duratec. I think I'd rather take the new chip burn of the Predator iff (and only if) the Predator allows for adjusting of A/F in relatively small increments like the APEX and MAFterburner. If they do release the Predator, it'll be dyno proven.
There are now 40 'yea's on there. But I find in internet polls, alot of people are willing to say they will buy it, but once it comes time to ante up the cashola, many go running for the hills.
40x$400 = 16000. Probably well worth it for them to get the ball rolling provided they actually have a car. Not to mention the 6 has only been on the market only 6 months, demand can only increase.