beckett,needlewheel, spray injactor etc.

was wondering in the past, h&S was very famous even now still quite popular among some reefer.
There are a few post on the sales of Aqua C and still unsellable. Is it because spray injactor aqua C have fault/error or is it because its not popular anymore?

Beckett claim that its more or less one of the best around,but how do one know if it can serve how much G of water? I understand that it might have the most fine bubbles around compare to the likes of aqua C and H&S,but will the reaction chamber big and tall enough to cope with the tank's bioload? Aqua C and H&S claim that it can serve up to 200G,180G etc. but how about beckett?

what happen if we have a beckett that isn't strong enough for our reef? In the end, it will problem will arise and might even result in crash.

anyway, are skimmers like aqua C really arent good enough mixed reefs or sps reefs? Would a H&S serve a SPS tank well? or do we really have to go for beckett which has no claims at all?