Chimeras are the best I have used but they are not cheap. I might opt for a photoflex next time.
I probably wouldnt do another Konova. its a little funky and by the time you fix or replace the diffusion materials its hardly worthwhile imo.
Just to give another perspective, I was really disappointed with the Chimeras. I tried a couple when looking for gridded softboxes and found them to be nothing special. They are well-finished and constructed but the light output & evenness was fairly average - below that of Elinchrom's own softboxes. When I factored in the cost of 20 degree grids (the widest I use), speedrings e.t.c. I realised that I could buy cheaper boxes and have them modified to my heart's content, easily surpassing the output & practicality of the Chimeras, for much less money.
The speedring is a little awkward but maybe its just how I put it together??? I've only tried it a couple of times for tests. The light seemed fairly harsh but should suffice for a rim light which is primarily what I wanted it for. I may ultimately modify the diffusion material so that I can use it for more purposes.

