Re: Mayones vs Carvin Kiesel Custom?
Keisel is the new "flavor of the month" amongst the djent set, and Mayones is the previous "flavor of the month" in the same crew. Never played a Mayones, so I can't speak firsthand, but word is the more recent guitars are pretty well made. I've played a whole bunch of Carvins, and they're pretty hit or miss. They tend to be awfully bright, but a mahogany necked, mahogany bodied Carvin singlecut 6 a buddy of mine owns was a stellar guitar, though to be fair I don't think I ever heard it with the stock pickups.
My advice? Figure out what you're looking for spec-wise, and then play a whole bunch of guitars until you find one with a neck carve you like. Then, order one with the specs you want and that neck carve. That's why I ended up with a Suhr Modern 7 - their neck profile, for me, felt immediately like home (it's basically a modern Strat with an extra string).