I use a Shockwave on my RX-1M with heavy hitters up front (because I never got around to buying Super Tips).
I have the Shockwave turned all the way out at the parking lot and spin a solid 10,500 RPM on the trails in lower elevations. As I climb in elevation I'm losing power (no turbo) and I start to lose RPM. Turning in the adjustment ring increases my RPMS as I gain elevation.By the time I have gained 4,000 feet in elevation I have the adjustment ring turned all the way in and I'm still hitting 10,500 RPM while climbing.
Before the Shockwave, I was hitting 10,500 at the parking lot and 9,600 RPM climbing. The extra engine RPMs climbing really have helped the capabiliy of the sled a bunch.
I highly recommend the Shockwave.