My problem with Space Distortion Effects is that, if intended as a replacement for the big blue ring, it would be a change in style/art direction, which is not really the purpose of the FSUP. as an addition it may warrant some experimenting.
As far as 2d rings go, I see what S-99 is saying - but I'm unsure how to solve it. the reason 2d rings always looked right, and functioned as a simulation of seeing a spherical shock wave (in a general sense) is because they were 2d and were always perpendicular to the camera.
As I understand it, the 3d waves are objects, and have no orientation in particular, which means that sometimes they look great and/or reminiscent of V's, and sometimes they look like star trek 6-style praxis waves. Not a bad look, mind you, but not perfectly achieved, either, and a little jarring, particularly when the detonation happens at an angle where you can see the 'cross section' in it's entirety.
But I'm at a loss as to what to do about it? is there a middle ground? would "always perpendicular" shockwaves look better if rendered in 3d? I don't know if it's possible in the technical sense, I just wonder if that's the sort of compromise people would like to see tested.