While I get the common complaint that people are making about having to buy multiple copies - it is only $35 or so. I think it is worth it to support our Amiga's. On the other hand, it does sound like most of the good people that have programmed it are not reaping the benefits of these sales - Only Hyperion is making money on it. Not quite fair, but it seems to be what they signed up for. I think Hyperion should send them all some $$ for their hard work.
My experience so far is mixed. I had real issues getting it to work on my A4000 Desktop with my Warp Engine, but those seem sorted now. I really miss things from 3.9 like the Editpad, the launcher and mostly the HDToolbox from 3.9. Oh well, I can find replacements for all of these. It really is very fast, and the new intuition library that allows you to move windows off the screen is most welcome. I have not gotten it to work with my RTG graphics, only AGA - but I also have not looked to deeply into it.
Once I am happy with 3.1.4 on my main machine, I may buy more copies for my A3000 and A2000, but I may leave my A1200 at 3.9 as a reference machine.