I've played Carvin amps, and I wasn't terribly impressed. I've tried out Carvin guitars briefly, and found them to be good instruments. I suggest that if your friend doesn't have the money for a Further (and since they seldom show up for sale used), he should consider a Roger Giffin. Roger was building a very similar guitar shape way before PRS was even formed, and his client list would be the envy of any manufacturer (Clapton, Page, Richards, McCartney, Harrison, Entwhistle, Townshend, Gilmour, Dire Straights, Head of Gibson Custom Shop, Fender Custom Shop Builder, etc., etc., etc.). For about the same money he can own a custom guitar where he can choose the features.
So much of this sort of decision lies with his preferred style of music. If you guys play mostly Grateful Dead and Jam band stuff, I say save for the Alembic. If he likes more of a traditional all around rock sound, I'd say consider the other brands.