I was able to dive my Rolock 90s last weekend and it didn't go so well. When I had set up the system, I noticed the left side was extremely difficult to self don; so much so that if I would apply as much torque as I could generate the glove would then rotate in the blue ring. The right side was nice and easy to don and doff, just like in the videos. However, when I dove the Rolock 90s I still couldn't self don or doff the left side and the right side, being so easy to rotate, actually separated underwater. For dive 2, I moved the right suit side ring past the alignment point in the videos and that helped a little bit. However, the rings would still move during a dive. I think if I had tried a valve drill, the rotation my right hand would twist the rings apart. The left side doesn't move during diving, as they are extremely difficult to move no matter the amount of lubrication. So far not a real good experience with the Rolock 90s.
I had contacted support about the left side when I first set up the system. I said I would try out the system and report back. When reporting back with the right side being the bigger problem I was told they would replace the system. I am waiting on that as they seem to be on order so it might be a while.
For a temporary fix, I am thinking of swapping the sides so the rotation of a valve drill would want to tighten the rings. Overall, I think it would be a good system if it just worked. However, I would love to see some sort of locking mechanism. Good thing I left full seals in place as it limited the water ingress.