Mike,
FWIW, I am using the V2.0x version on my Phoenix 35's and 45. I am very happy with the way it works on my stunters. I don't think there is a lot of new stuff for CL uses in the 3.0 for the older Phoenix ESC's. Now if you had an ICE version, that would be different.
I would wait for Crist to respond on the V3.x software, I think he has the best handle on it.
Eventually when all the dust settles, I do plan to upgrade my Phoenix 35's and 45. Since I have one Ice50, I am stuck with trying to support two separate versions--actually not true, since I haven't changed my older Phoenix's for quite a while now, but the time is coming when I probably would want to change some parameter--just can't leave well enough alone!