I have had M2, M7, Vv7, P7 and a green U5 (because of the colour). I sold the lot and only had a P10 from Sire that I really like. I regretted selling the U5 and bought one again, this time a natural (my P10 is also natural so they are sort of the little and big brother. I have put some La Bella 760F-MUS (Deep Talkin flats) on it as I prefer flats on my short scale basses (I have a Lakeland HB30 with flats as well, this one is on par with the Lakeland apart from the tuners that are better on the Lakeland).
The neck is smooth as butter, not too skinny, not to meaty. It balances well and I like the passive pickups. If you are in the market for a short scale look no further. Light as a feather, good balance and a perfect little bass. LowEndLobster gave it 5 out of 5 claws, and I could not agree more.