I have skied and owned almost every Head iteration in this width, from the old Monster 88 to the REV 90 (including the iPeak 90). The REV 90 is the best of all of them (though, the iPeak was pretty awesome as well).
I Have about 10 days in on the REV 90-exclusively in Southern New England, with a few tree days at Mount Snow, and a lot of funky mixed condition on Piste days (rain and warmth on early season man-made is about as funky as it gets). It's a very, very 'easy' ski. By that I mean it forgives lapses in technique but delivers smooth performance.
Most of the reviews, pro and con, of this ski are spot on. Everyone will note it's easy going nature with a fairly high performance envelope, but some will say that makes it a 'blah' or dull ski, while others will applaud that characteristic making it a great, sleeper all-mountain ski for a lot of skiers. People who love the Bonafide or old the Volkl Mantra won't like this ski, Those who skied the Rossi E88 and wished it had a little more guts and a touch more float will really like the REV 90 (or the NEW E88). There is a lot to be said for Medium (medium flex, medium radius, medium forgiveness) if it is done well. And Head nails this ski.
The REV 90 leans towards carved turns but tolerates pivoting, short turns are a breeze (for a ski of this width) and it handles speed with reasonable aplomb (again, with the caveat 'for a ski without metal!'). I have about 10 days on this ski this season, skied exclusively in Southern New England with a few days in the Glades and pro to bumps at Mount Snow, and a host of on-piste days skiing very funky rain and warmer man-made snow (so from traditional groomers to 'east-coast crud' if you will). I am impressed by it, as it is relatively unflappable, smooth and surprisingly quick. The iPeak was a very good ski, this one is better.
If you are a full-grown man, I wouldn't ski this any shorter than the 177cm, regardless of what sort of turn you prefer, you'd give back to much stability, which a ski like this needs to make it the great all-around that it is.
And the Price is right with these skis.
ALL that being said, the New 2015 crop of 88-94mm waisted skis is stunningly impressive. I have skied the k2 90xti, The Powertrac 89, New E88, Brahma, and Nordica NRGy 90…they're all wonderful, versatile and fun. You can't go wrong with any of them, I made my choice exclusively on price, and the general quality of skis right now makes that a viable approach.