The one other thing to keep in mind with G&L:
the string spacing is narrower than most. This bothers some folks-like me-and not others.
ymmv.
I played 19mm basses for 23 years before I took a chance on my first L2500. It took a lot of work to get comfortable, and after 2 years, I still wasn't totally comfortable. I even put 0.5mm shims between the saddles to give me a full 17.5mm (silly, yes, but it helped). However, I loved nearly everything else about the bass so much that I'm willing to keep at the narrow-spacing thing if I can get a new M-2500 to my own specs. The new M-line solves my other issues with the tone that I tried to solve on the L2500 through single-coil switching and an EMG preamp. If it's as good as I imagine, I'll be happy to deal with the spacing.
Oddly enough, the 17mm spacing and the lack of airy highs don't bother me at all on my fretless L2500. I am mainly running it to an external ACG EQ02 filter preamp now, and I may add single-coil switching, but I won't change anything else about that bass.