The bearing upgrade is for any rear hub with a vide test ends in 1 (it’s anodised on the hub body).
CRC had a load f the upgrade kits which they were sending out although it was just the bearings and new end cap but not the fitting tools.
I have the Havocs and have been really happy with them so far. I bought them in March / April and they’ve been fine with regards to bearings (although I gave just fitted the upgrade kit due to he bearings getting a bit rough). The hub bearings have lasted longer than my Hope headset bearings which have just been stripped and regressed due to grinding.
I went with the Havocs because they didn’t weigh much more than the Havens and were 20mm compatible. I also liked the idea of the wider rim because I run biggish tyres. My only disappointment is that the freehub pick isn’t as quick as I’d like. My a SLX cassette has also chewed up the freehub, so I’ll be getting an XT one next time.
I think they’re good wheels, but I’d never pay full price for them (but I’m a bit tight).