I guess I might as well give my opinion on the Ducky green switch keyboard I bought back in December.
Coming from a guy who was happy typing on MX Browns and Reds, the Greens took me a lot of getting used to. In fact, the force difference is so great that I made typos often, especially with my weak pinky fingers. After a couple weeks or so of regular use, you get used to the force of the keys. Another thing to note is, as a touch typist, I can't type on this keyboard as fast as I could on Reds or Browns. I do make less typos than with Reds.
I have a feeling that PBT keys combined with green switches actually produce a slightly quieter sound, in which the high pitched click is not as sharp as one would normally expect from ABS on blue switches. It is a pretty pleasant sound in my ears, although I'm sure it would still annoy anyone else in the room just like blues.
Gaming on greens is no problem. I would say that it might be better than gaming with blues, since the stiffer springs may pop the key back into position slightly quicker than possible with blues. However, this is purely opinion and is not based on any scientific evidence
Overall, I think green switches are nice, but are not my favorite switch. I had a lot more fun typing on my CM Storm Rapid with red switches. I'm happy to own a keyboard with green switches simply because of the novelty and rarity of green switch keyboards (although it may get popular in the future, who knows!). That said though, I've been using my Ducky with green switches since I got it, and even pimped out some of the keycaps with translucent polycarbonate over the lit keys.