Are they as hard to get some spares for as I’ve read?
Normal lowers-type seals no problem (I believe fox stuff will fit too). Damper or airside rebuild kits, you’d have to buy from the US which is £££ when postage is taken into account. It’s a deliberate policy – they want you to send it in to Upgrade for service.
This has been an issue, particularly with the RL2 damper which has failed on a couple of forks for me. In theory you could strip one down and buy the necessary o rings from a supplier though, which would be a lot cheaper than getting any kind of kit.
The only other issue with the RL2 is that the bit you screw the lockout knob into, and the bottom of the damper rod, are made of cheese – you need to buy the damper removal tool or be very careful if you want to take the lowers off.