Cool. Looks like it would be neat to play with, and the price is reasonable.
I tend to view it like you do, but if I was going to try one I'd be tempted to try this
Numyth Vulcan v2 piston. However I don't recall ever seeing a fire piston small enough for an Aloids tin.
Those reviews have to be fake, or all the bad reviews were deleted.
Why do you say that? I know that not all of their reviews are fake because I have written reviews that are posted to that site. Perhaps they delete bad reviews but I doubt it, there are poor reviews for other products.
All in all I don't think a fire piston is a great tool. As others have said they're fussy, they require maintenance and lube and are not super robust. Personally I prefer a firesteel even to matches.