I don't have the system, but a friend who works at my LQS tried it when it came into the shop and says it's too limiting. Since all you can do is strips, you still end up doing a lot of regular rotary cutting.
She also has RA and prefers the Quiltcut 2 system.
She has also tried the Accuquilt GO (way too pricey for me these days) but says she found it too painful to turn the handle.
I've since read that it loosens up somewhat in time.
Hope you find something really suitable. I have a good deal of pain from fibromyalgia and I'm always trying to find easier (inexpensive) ways to get my cutting done.
If you try something and like it, I sure hope you'll post about it.
Just for curiosity, how are you with scissors? I've been looking at something called 'Inklingo'. Here's a link:
http://lindafranz.com/section/inklingo-home/1
You can use either scissors or a rotary cutter and since sometimes a change is as good as a rest, that might apply to cutting, too.
I haven't tried it yet because I don't have a printer right now, but it looks like it would be helpful for me. Maybe you, too.
Happy Quilting!