GPS works like a charm using GMXT 4.10.60. I've never tried the preloaded Maps though... that's a lame app bundled.

With Assisted-GPS enabled, lock time is barely 10 secs, w/o, is roughly 30secs.

The v20 firmware is definitely faster but still N95 8G bests it hands down. I'm now thinking of changing to 8G myself.