If the bearings for the XMods are as good as the ones that they sell for the Mini-z, they will be worth waiting for. I couldn't believe how well they worked for me. I spun my front wheel after intalling the bearings, and it spun for like a minute without stopping. I showed one of the guys I race with, and his jaw just dropped.
BTW, does anybody know if the Mini-Z store and the rest of TRC share a common shopping cart? I ask because I would probably pick up a bunch of items from both stores in the same order, and I know all the stuff I've ordered from MZR shows up as TRC on my bill...