Brand: Garmin
Model: GPS10
Works? Worked with MM OS2007, but neither MM nor Map in OS2008
Startup Time: Relatively slow.
Sensitivity: OK
Rating: 6/10 (Still works with my Garmin software, which requires a Garmin receiver)
Battery Life: Est 7-9 hrs. Non-replaceable battery.

Brand: GlobalTop
Model: G33 (51 channel MTK chipset)
Works? Great with all but my Garmin software.
Startup Time: Very, very fast.
Sensitivity: Super sensitive.
Battery Life: Long, but not tested. User replaceable battery.
Rating: 10/10
Comments: Auto shutoff if no BT signal for approx 30 min, to save battery.