I've been playing the Tensei CK Pro Orange (not 1K) for most of the year, and just started playing the 1K blue (non-Pro) in the TSR2. I've hit lots of mitsubishi blue variations of the years and to me this 1K Blue offered by Titleist is significantly more stable and better performing than those past non-pro variations (AV, CK, Diamana, etc). In fact it feels almost as stable as the Pro Orange I'd been playing, and seems to be lower spin. I'm a fan of the 1K Blue so far.