Just got home and had a nice little surprise waiting for me. This is such a cool light, probably my favorite McLight to date. The crenelations on this head are noticeably shallower than the ones on the Aluminum S27 PD, although I can't decide on which one looks better. One thing I did notice is that the twisting action on this one is not nearly as smooth as my fat tailed PD from the May wave. Why that is I don't know, but it is noticeable. Overall, Don has really out done himself with this light, the 27L head is just plain awesome! Now bring on the LunaSol's!