I'm just making the switch to the 15 and 30 pro from gen 2's. Currently I'm using the 15 over a 2x2 portion of the tank. The colors are crisper and the uv adds a pop.
I'm running the G2 xr30 pros over my 20g with the 120 degree optics for about a year and a half now peaking at 50% and would have definitely bought the xr15 if it was out. I absolutely love the Radions with an acro dominant tank. Here is a picture with the tank as a bit of a mess just a week after moving 950 miles with it from a few months ago:
I'll try and take some more pictures this week now that things have regained most of their color after sitting in a cooler for 3 days!