I'm at 30, and it's pretty awesome. I was hesitant to try it, but after 2 weeks in my 7G, I can honestly say I don't intend to go back up. I use BHBR exclusively as my main (the spin is sick), but I still experiment with crosses from time to time. I had a package of WC Silverstring that was just hanging around, so I used that with BHBR at 30, and it is really nice. I like SPPP better (cheaper, too, but similar) so I bought a pack to try it. My standard set up is Isospeed Baseline Spin, though. Great feel, spin and makes string jobs about $3-$4. Hope this helps!
POG 100 with Black Zone @ 58lbs