I have both the MWME lever and the Clake One Light Clutch on my X-Trainer (it's clutch feels the same as the RR). I love both of them actually. I got the MWME while I was waiting for the One Light (there was a long wait, but it turned up earlier than expected). Contrary to the earlier post, I was very impressed at the full clutch disengagement and the very light feel. We measured the strain and it did reduce the force by almost half. It wasn't as good on the KTM I had last year but on the X-Trainer it seems to be a perfect match. I loved the feel of it and it really helped with avoiding finger fatigue on the technical stuff.
The Clake One Light is the shizzle though. More expensive but the feel of it is amazing. Most of the guys I ride with use it now. You can lighten the feel using an adjustor screw but if you make it too light, you lose "feel" but even so it's amazingly light. The other thing is that the finger hook that the Clake uses is just fantastic. Once you've used it you will never be as happy with normal levers. It's such a positive connection between your index finger and the clutch. Brilliant.