I’ve bought a few MTB sets over the years, I think I went through 4 freebodies, but they always replaced them FOC and oddly, the warranty clock seems to reset with them with every replacement, I don’t know if that’s policy or luck. I don’t see that type of Novatech (I believe) design hub any more.
I never bothered with the free truing service, by the time you pay for postage you might as well use your LBS, but it’s how they work any warranty issues (bar freebodies) basically any issues, you send them back for the truing service and then discuss faults, I trust them enough that they wouldn’t hold you to ransom to repair any non-warranty error.
I’d be happy to use them again, the last wheels I bought were actually Nukeproof from CRC because they were about £200 and I needed a set on the cheap, next-day and they’re actually brilliant.