The main advantage of FPGAs is not really the lower power draw, but the versatility.
Of course, sorry if I didn't make myself extra clear on that: the FFPG are used to mine coins that are "ASICS RESISTANT" as they have intrinsically some characteristics that cannot be managed by an Asics. Nevertheless ALPS keeps pushing for this technology to create an efficient miner also in small offices, houses, etc...
To word it correctly, whoever 'ALPS' is, they're scammers.
People will always try to convince others to buy things that are useless, and pretend they are worth way more so you'll pay a lot for them.
You see it all the time on ebay even with ASIC miners, people selling old miners for 10 times more than they will ever make mining on free electricity.
Look at it this way:
You can order a $200 tiny USB miner that does 300GH/s or more, at 15W or 20000MH/J
There's no way you could even get near 20th of that performance per Watt with an FPGA.
The FPGAs almost 10 years ago were doing about 20MH/J
https://en.bitcoin.it/wiki/Mining_hardware_comparisonWhile you might think that since then, FPGAs have increased in performance per W used, they've done nothing like 1000 times in reality and they can't due to what an FPGA is vs what an ASIC is.
It's the 'FP' that causes that, Field Programmable, i.e. changing the paths in the chip.
As for discussion about "ASICS RESISTANT", none of that belongs on this part of the forum, take it to the scamcoin area.