Yes they all take cartridge bearings, email superstar when you need new bearings and they’ll tell you the size needed for your hubs, they’re honest about the reasons they don’t keep a stock of bearings….basically you can source them elsewhere for cheaper….i’ve always found them helpful, when I snapped a spoke I emailed them, they replied promptly and I was then able to take that info to my LBS who repaired the wheel
The basic Switch hubs are Novatec, they’re easily serviced at home, axle swaps are a doddle, several WC-DH teams use Novatec hubs and more and more bikes are coming with Novatec hubs as OEM kit.
There have been teething troubles, the original Tesla hub was fragile, it has been superseded by the Tesla-evo which is great, swapping between axle standards is as easy as popping off end caps and clicking the right size ones one instead
I have some basic Switch hubs on my HT that take the worst of the Welsh winter and uplift days to Antur, BPW, FoD etc and are still like new, my Tesla-evos are also running great and well over 12 months old with no rough running.
I use Superstar’s wheel builder because the hubs work well and are a steal and then I can spec rims from DT, Mavic, Stans etc for a hard hitting set of AM wheels for significantly less than other sites offer….of course if you’re a label snob then hubs by DT, Chris King etc are available instead.
Highly recommended, if on the off chance you get a shonky set of wheels your LBS will usually true them up for £10 per wheel so you’re still quids in, the economy of scale they work on is huge, I’ve always had great service and also have some road wheels from SS too.