So if I have Ultimas right now I should be able to swap over to rolock 90s with no issues? I'm using showa 660s and if the install of the pvc gloves is as easy as this looks, this seems like an easy choice.
If you are using your Ultimas with a drysuit that has the PU ring from the Si-Tech QCS oval system installed, then you should be able to swap over to the Rolock 90 without any issue.
-Z