I just got a Sunray probe for my E Trac last week and love it. It gives great depth and I like the ability to hear what I am pin pointing in the actual tones the E Trac uses.
The Garrett is an excellent pin pointer too. It is not as deep and I find that with the Sunray, in discrimination mode while pin pointing, I can get a much better idea of exactly where the target is in the hole.
On the other hand, during a club treasure hunt over the weekend, I found I was using the Garrett. I just left it turned on which was faster than toggling the Sunray and messing with the cord.
I think I will keep my Garrett as a backup, but for me after only a few days, the Sunray is the way to go.