Stock/original firmware, with GPS "Fixes" in LbsTestMode (+ setting Accuracy to 150):
Satellites in view: 8-10
Satellites in use: 4-6
Accuracy: 16-32 feet...
Lock time: ~40 seconds first startup, 10 seconds thereafter
I've had these results over a span of a few days... I'd like my satellites to stay locked (they are constantly being dropped and re-locked), but it doesn't really affect the overall accuracy... so all in all, I am mostly satisfied with my Captivate's GPS performance.