Below is a copy of impressions I posted on the S5 review thread. I suggest you demo as my experience with the S5's I bought was much different than with the 5* I demoed. If anyone has any thoughts would appreciate it.
I was planning to buy 5 star but given they have been around for a few years wanted new model, so had my shop order s5's in size 168. Picked them up last thursday and took them with me up to Mt. Tremblant in Canada this weekend. Had a few quick reactions when I picked up the ski 1) very heavy, 2) very thick (height in mid-section, 3) while its only 1mm wider at tip it looks much wider. On the mountain my experience is consistent with most of the comments above: extreme grip on ice and while carving, very stable at high speeds, responsive, easy turning various types of turns, did not get thrown around in crud/slop(up to 8” was what I encountered), and quite forgiving – could get in the backseat and not get kicked off. Only disappointment was that I found the ski rather tiring whether I was skiing with my 4 year old or out on my own. Might have been 1.5 degree canting I was trying on my boots for the first time, but my sense is that the ski’s weight takes a bit out of you and overall that the ski also requires lot’s of energy from the skier. Not at all like what I experienced demoing the 5 stars and even allstars or some of the reviews I have read about other high performance carving skis (e.g, RX8) that provide “all day tireless skiing” as written by the reviewers.
Reconsidering whether this is the ski for me and might be selling and getting something else.
I am 5’10”. 160lbs and a level 7-8 skier. My older skis are Volkl Motions (4 yrs old I think) and Rossignol Zenith Z5’s.