I don't trust Vortex anymore. Bad experience myself and I've heard too many as well. Sounds like a good deal though.
Try and go through paypal with a credit card if you can.
I actually bought my cluster off of a Vortex ad from a Canadian, everything went smooth. Also picked up a bunch of TD specific parts from another Canadian Vortexer, again it went very smooth. I think you just have to be careful and research the person you're dealing with.