I'm really trying to get used to using the UMP silenced because it just has so much potential. 32 round mags, 40-35 damage (3 hit kill any range without stopping power), full movement speed, SMG hipfire and full ADS walk speed, etc.
I'm struggling with the sights (gun takes up a lot of room on the screen) and apparently SMG's don't get as much auto-aim assistance either. but it's very cool to have a free perk 2 and to be able to use ninja pro and still have great hipfire.