I have the prime race disc wheels. I’ve been using them since October last year. Yes they’re light and when the bearings haven’t gone they are great. Service kits can be bought on CRC or Wiggle however I went to Wych bearings and bought some decent replacements as the stock ones lasted less than 500 miles, albeit there was some CX races (about 4 or 5 I think) in there but nothing too muddy. The anti bite guard on the free hub also detached, making it kind of pointless.
They work very well in a tubeless set up, I’m running them with Schwalbe CX Ones and no issues running low pressures. Spare spokes that come with them is a nice touch as is the ability to replace the axles. The rear has gone ever so slightly out of true which surprisingly I’ve never had happen on a set of factory wheels before.
Easy enough to service as well. The freehub just pulls off and you can knock the bearings out. They use Novatec hubs I’m pretty sure I’ve got the hub numbers somewhere.
I’ve used them a fair bit off road so would suggest a bearing change to some Enduros or some such before embarking on a long trip. I’d also make sure you have a spoke key in your bag!
As a sub £300 light set of wheels once you’ve changed the bearings they’re pretty good.