Excellent pistol. Holstering with thumb on hammer gives you one more "safety net" against accidental discharge if cord from clothing or something gets caught between trigger and holster.
Most users of my acquaintance find it's faster to use the trigger finger to activate the magazine release lever. Safer, too, since it gets that finger out of the trigger guard.
165 grain Gold Dot at 1140 foot-seconds is one of the best, most street-proven .40 loads out there.