I have a couple buddies who each own a USS. A few things...
1) FYI, they were not originally low deflection shafts, they are all low vibration shafts. There is a "regular" version, and a newer and seperate "low squirt" version (note that they are the only company I can think of that properly uses low squirt and does not incorrectly use low deflection terminiology). When looking to purchase one, be aware of the two types.
2) There are numerous adapters, but not adapters to cover every type of joint. If you have something non-mainstream, you may find that you have to have an existing adapter modified, or have one made by a machinist.
3) It was reported a couple years that the original maker (Cue and Case) for the Smartshaft quit production, I think the story goes that it was due to a patent issue or something like that. I don't know if that was ever true, I see Atlas is still selling the shaft, Cue and Case still has a Web site for the shaft. Perhaps the discontinued production was not correct, perhaps there is just left over stock still available, or maybe production resumed. Hopefully somebody here can clarify.
4) The joint seem to be a weak spot if overtightened. Basically, people tend to over tighten the shaft, just as people do with their regular cues. Over time this wrenching of the shaft twists the adapter to the point of failure. I've seen this first-hand and had to extract a broken adapter more than once. I think if you search the forums here you will find others with the same experience. If you purchase one treat it like a fine instrument, and maybe buy an extra adapter
All that being said, it's a pretty nice shaft. I've only tried the "regular" shaft for a couple hours. It is of good quality and construction, feels good, and plays smooth.
