thanks ya'll.
no it doesn't bind when I spin it off the bike, the cassette turns smoothly. I didn't think to check the RD and its setup. I have Bontrager Race wheels with a 10s Ultegra cassette on the bike as stock/training wheels that came with the bike. I bought a set of SL's slightly used to race on. I put a new Ultegra 10s cassette on the SL and then just threw it on the bike.
I didn't adjust the RD, I didn't think it would need it, I will put the wheel back on and re-adjust the derauiler.
I thought maybe that if you tighten the cassette down too much that it might somehow affect the free spinning of it.