i have the shaft, but not the butt part. the shafts are great, basically they are the old universal smartshafts without the changeable joint. no hollow spaces in the shaft, which gives it a very solid hit. there is low deflection technology in the ferrule area. not as low deflection as a pred/ob, but still much lower than a standard maple shaft. the shafts are also on the heavy side, which i like. definitely recommend the shafts if you want low deflection, but the feel of a solid maple shaft.
they make them in a variety of joint styles just like other aftermarket shafts. no partials though, so it's generally a black collar or with a silver ring. I have mine for a radial pin that I use with various cues. they also have a slim 11.75 version, but the taper on that is horrible. they went with a pro taper instead of conical, so the thing is whippy as hell. these are two great places to get them:
http://www.billiardwarehouse.com/cues/lucasi/lucasi-flexpoint-shaft.htm
http://stores.shop.ebay.com/Nielsen...017QQ_sidZ11113657QQ_trksidZp4634Q2ec0Q2em322
also, what i like about the shaft is the taper is slightly longer and quite comfortable, but still fairly stiff. it's stiffer than the 314^2 and ob-1.