I've had a pair of iq10s for about 18 months and love them but just checked KEF's site to see what was new and stumbled upon the new line. The aesthetics are less preferable than the iq series but I'd really like to hear them. I entered the contest on the front page for the q300s. That would make my day.
I'm using a Denon AVR-789 to power the two iq10s and have an old 1980's set of C10s that I use for a center channel. Well, I'm using only one of course, but hey. The tweeter blew out in one of the C10s so it's just being used as a stand for my monitor.
In Canada, the Totem Rainmakers is around the same price range as the Kef Q300s, yet I feel the Rainmakers are in a total different league. I own a pair of Kef iQ30 which are part of HT setup which also includes the rest of the iQ range from iQ60C to iQ90s. I haven't heard the Q300s, but the iQ30 is too laid-back for my tastes, voices sound muffled, and dynamic range is limited. They are good for HT but not for music/hifi. The Rainmakers are far superior speakers that make voices sound natural and engaging and the soundstage is incredible. I also prefer the curved cabinets of the iQ series over the boxy cabinets of the new Q series. I guess Kef tried to lower production costs by making square cabinets over curved cabinets as they are cheaper and easier to manufacture.