Very interesting I wasn't familiar with the LTD GC-P4. Based on price, specs and look, I'm betting it's a vietnamese bass directly derived from the LTD Vintage 214 model.
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I reviewed the 214 here and much of it should be directly applicable to the GC-P4
ESP/LTD Vintage 214 Fretless | TalkBass.com
The GC-P4 has the same body wood, hardware (though the P4 bridge has string-through-body) and pickups as the 214, so the question is whether the $120 upcharge ( 214 $380) is worth it for:
-Maple neck with no inlays (very striking)
-String through body option
-Black hardware and headstock
-V/Toggle control arrangement.
I've got the fretless version of the 214 and I'm very happy with it. Personally, I think the upcharge would be better spent on pickups. The Stock "ESP Designed" (built by G&B) pups are actually quite good, but the Geezers I put in my 214 are better. However if you like the maple neck, black head and hardware and control layout, then $120 seems like a very reasonable upcharge for those features.
As far as Bello, the new FB-204 (the lower priced Viet version) is probably a better comparison.
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At $450 it's a $70 upcharge on the base-model 214 and for that you get a boost preamp , satin black body and head and MOP inlay/dots.
The pickups are covered, but they're listed as passive "EMG Designed" LDP and LDG just like the Vintage 214. Controls are Volume, Balance and Tone boost. Sounds nice enough, but I personally really like having two volume knobs so I can keep one pup up full and bring the other in incrementally to add just the right amount of flavor.
Lastly, a pic of the GC-P4 just for easy comparison of the 3 models.
I do hope that these artist models are a sign that the 214 is catching on and we'll be seeing new versions in the future. It's really a great platform that more folks should be aware of.