Like I said before, I like the looks and specs of the Solar basses. The cutaways in that sleek body shape would give me great access to all 24 frets. I've spent many years playing in and touring with punk and metal bands, plus I dig on unique basses that not everyone and their dog is playing (that whole "stand out from the crowd" type cool factor). My main bass is a heavily modded LTD HTB-600, which has a "metal" shape. Ergo, I feel like I'm at least somewhat part of the demographic Solar would want to target with its basses.
My main objection lies in the 4/5-in-line reverse headstocks, because it makes replacing the E or B tuning pegs with Hipshot XTenders (and actually using them to flick into D or A respectively) more of a pain-in-the-neck than it needs to be. Given that modern metal players/bands like drop tunings and are creating music where you need to switch in and out of alternate tunings on the fly, you'd think that having a 2+2 headstock where players can easily drop-in-replace desired tuning pegs with Hipshot detuners would be a no-brainer in terms of metal bass design. The reverse inline headstock looks "metal," but doesn't function the way I need it to BE "metal." If not for that, I would be keen to try out that 4-string.
And I'll admit, black basses bore me. I think a transparent crimson/blood red would look badass on that 4-string, especially with some black highlights to make the wood grain pop. That literal "fire and brimstone" color scheme I'm imagining would be totally metal.