While it appears a nice gesture (/marketing gimmick), it doesnt really account for much.
t kicks in after 90 days, with no promise of when it will ship. By the time you get it, it may be like getting an extra FPGA from BFL today, or rather in 3 months.
Worst of all, you get the chip, not the miner. How much they charge for the miner is completely up to them, so your free chips may be worth nothing. So its more like getting an FPGA chip from BFL. Wouldnt that make you happy?

THat said, I have no reason to be more confident in Cointerra or  hashfast's ability to deliver. On paper both have the right experience.