RE: ? FOR LEN
This design is basically a design that has been done many times over and is very similar to the Stalkmaster that I discussed in another thread. Another company did a similar thing with the springs a couple of years ago and promoted it heavily at the Harrisburg Sports Show. Their springs were entirely too tight and the result was pretty bad.
It will work well IF the springs are the proper tension to allow adequate movement of the shaft in this non-perfect world of archery. The type of nock travel in your bow, how well you can tune a bow, and what you're willing to accept all play a role in how well this rest will work.
Without doing an evalution/test on this rest, that's all the speculation/analysis that I can give at this time. If they'd want to send one to me, I'd be happy to test it.
Good shooting.