I've had my Fender PJ Mustang for about a month now. Love it! I realize that every bassist has their "preferred "tones and types of music they prefer/play. For me, I do classic rock, a little bit of jazz, a bit of pop country (ie Keith Urbanish), and contemporary Christian , etc. I play with a Christian rock band, and yes, we do some hard rockin. My band mates were afraid that there wouldn't be enough "low end" for some of the songs we do...NO WORRIES! The Mustang came through the mix just fine! I've grown tired of hearing that a decently set up short scale can't do what standard scale can. If I want to go really low, I use a DigiTech Drop Tune pedal. Much (but not all)of what can, or cannot be achieved from an electric bass has a lot to do with the bassist's knowledge of how to properly use their amps, pedals, boards, etc. I really don't miss having a 10-11 pound bass hanging around my neck when we do a 2 hour gig. I've got my Mustang down just below 8lbs. Hipshot Lite Tuners...still balances perfectly.
I hear many say that you can't get "this" particular bass sound with "this" particular bass....I'm understand that there are some unique tonal qualities out there but, as far as having an "all-around bass", this PJ Mustang short scale is capable of covering a lot of ground. If one becomes more familiar with the tone of various strings, all the technology, amps, pedals available, and (IF you are playing through a mixing board) and you have a competent tech person running your board and mix, the possibilities are endless. I've had people come up at venues we've played at and ask me how I got such a "bright" sound from a Pbass. All I did was adjust the EQ on the amp and used a hand position closer to the bridge!
I have several other basses, "low" to "intermediate" price range, both standard and short scale, 4 and 5 string. I'm confident enough at this point with the Mustang, that I've already put three of my other basses for sale on the classified forum here at TB. "Thinning the herd", so to speak. Your situation/requirements may be different, but I just don't need 7 different basses at this point!
Bottom "low end" line: I like the Mustang! YMMV!