I don't have one, but I know 2 people that have them and know of a couple more. The 2 people I know say (and I've seen) that the rc18t's are very quick and handle great in stock form, but are fragile. At the track 2 weeks ago, the first time one guy had his out, he was going around a long sweeper (and not very fast) and lightly clipped his front right wheel on the foam track barrier. Well, his upper camber link snapped in half and the top mounting place for the shock snapped. It was crazy because watching it happen didn't look like he would have broken a thing.
There has been one person that I know of that came in the HobbyStore saying how easily his 18t broke.
So until they get the kinks worked out, I'm waiting to pick mine up. I checked out the Trinity IB Sypder, but it comes with bushings and friction shocks.