I have had really good luck with my SM tubes. They are might lighter than the CRC's, and they dont bend or break. The CRC's are notorious for bending during impact.
Spyderx- I run the IRS plates, however there are 2 different designs, one is like the Darkside one (except annodized in different colors) than there is another one like the CRC. The CRC look alikes (and maybe "are-alikes") do bend rather quickly. The ones that look like the Darkside ones (and very well maybe) last forever, I have ran them for over a season. So if you dont mind black annodizing then I would go with the Darkside ones (they are pretty cheap as well), or risk it buying the IRS ones (since i have seen them sold under both types, as odd as that may seem).
BTW, see you at the track on Saturday, I should be there in the afternoon.