That is interesting, as I was never able to get impressively big clouds from the SSV... then again, I am not stingy with how much I put in, and usually put like 0.3-0.5g in at a time. I think the main reason why the FC forum hasn't taken to the Plenty is because you need to load the bowl up to get good hits, much more than with other vaporizers - it's one of the Plenty's quirks.
In my experience, once you load it up fully, it is good for several sessions/rotations, and the amount you put in is offset by how long it lasts - once I load it up fully, I have enough vapor to last me the whole day if I'm vaping by myself. I just turn it off when I'm done and detach the heating element from the bowl - whenever I am ready to resume, I just start it up again and put it back together. Even with this caveat though, I don't think it's as efficient as rival vaporizers - I'd say just about average as far as vapes go - and I think this is probably why it won't catch on with the crowd here.