my experience with stan's has been positive. lost some weight but mainly due to folding bead tyres instead of wire beaded ones, weight loss was not particularly significant unless you're being a weight weenie? anyways, pinch flats have been a worry of the past, but i have yet to add extra sealant in the tyre which may pose a problem. only real difficulty with initial setup was the availability of a compressor, but once you have that, follow instructions carefully and setup was a breeze first time.