My 2 cents worth: I'm using the Midwest Mountain lever on my 300RR and like it. I'm an old guy (57) with a skeleton full of surgical hardware and a lot of joint injuries coming back to haunt me.
The reduced effort is definitely noticeable to me. It does need to be pulled to the grip for full disengagement, but that was an easy adaptation for me - easier than I had anticipated. I also like the shape and length of the lever - it just feels right.
I ride mostly tight woods single-track, so the clutch is rarely all the way in or out for more than a few seconds. I'm happy enough that I think I can put off buying a Clake for a bit. I've used auto clutches on several of my race bikes in the past, but I really prefer full and precise control, even if it makes it harder for me in some situations -- I mostly just play ride now anyway.