I had a pair of K2 Xp's last season. I used 'em twice,once November crud, slop , ice @ Killington and once in January on Packed powder w/ spots of ice and spots of 3-5 inch powder.
I could not believe how dead they felt, the second time out i went back to the car to chage 'em for my 168 Volkl 6stars becauce it felt like i was on 2x4's.
What a difference...In hardpack New England conditions the cross type ski ( 5,6 star, sx9, 10, hear irc, etc) is way better for edge hold, turnpower and all round fun.
Xp may be a West Style ski, because many swear by em.
I think (hope) the Metron series is the answer!! Wide enough for float in rare powder conditions, good in slush, crud, re-freze and a tight radius carver to boot! Atomic claims they are a true All Conditions ski.
I got rid of the Xp for M:XI in 162 ( 12m radius, huge tip and tail and 76mm waist).
I don't think they duplicate the XP experience, however if you have the xp's for those deep, crud and slush days you may be better of sticking to a SX 9 or 10 and really enjoy the narrow waist, quick turning , edge gripping power on hard snow.
Time will tell.