Yes I have had one for many years. This is a truly excellent bass for the price. From what i understand it has the same pickup and electronics as the EBMM version. It has a nice fast (Lacquered) neck with a "jazz" profile. The main difference between the SBMM and the EBMM is the body wood, which is basswood on the SBMM.
Playing wise, the body is nice and compact but not particularly light. It weighs about the same as my EBMM Stingray. The lacquer on the narrow neck is not at all sticky and the action goes very low on mine (2 mm at the 12th fret), overall leading towards a very fast playing neck.
Tonally the output from the ceramic humbucker is very hot indeed and it will clip my SVT without attenuation. The tone is classic Musicman - very punchy and with those characteristic overtones. It's much fatter sounding than my stingray though and rolling the mids off on the 3-band EQ can make it sound a bit honky. This IMO is a bass good for rock, blues and metal. Because it slightly lacks the clarity of a Stingray, strings feel like they go dead a bit more quickly, so it's not an optimal bass for slapping - for that i use the 'Ray.
However, I replaced 2 USA P-basses and a Lakland Bob Glaub with my SB14. In a live rock band situation it just sounds better, more agressive and just cut's through the mix superbly.
If you are after a more funky clean sound though, I'd pay the extra and get a USA Stingray.