i don't think i spent "lots of money" ?? i spent enough money and yes ... yes they are cool aren't they

on a serious note : if you are planning on running spacers with you trx rims (or any rims for that matter) if you run a bead of silastic around the spacer then stick it to the wheel, then bolt the wheel on and let the silastic set, if you need to take the wheel off, the spacer will stay stuck in place, on the wheel.
also for the fact that spacers are pretty much illegal for the fact that there is something between the wheel and hub thats not secured and is able to move, then if it's stuck to the wheel its kinda less of an issue in the event you have to remove a wheel .... hope that makes sense