Nope i haven't heard anything, but I wouldn't be the first one anyway I guess. They do look nice but they really have to change something to make it worth the money...
I can by them locally for about $50 and that's at least $40 to much....
I do have two of the old ones and are finally starting to get some useable power from them. Both of mine had an error in the plastic part were the fuel line is connected. The plastic doesn't match the brass and the holes are missaligned which limits the fuel draw at full throttle. It is a rather quick fix and then it kind of works. On a cox gray 5.5x4 I get around 15000rpm on the stock head and about 16000rpm using an AP Wasp plug, so not much to write home about but enough to get something in the air...
(a very short video with the engine ruinning can be found here:
http://rcuvideos.com/video/CS-061-RC )