Only had one ride so far Elaine, but it certainly does ride 'lighter' than i was expecting. I own an '04 Mount Vision as well & that climbs pretty well & the Wolf Ridge isn't that far behind to be honest. I suspect on a long all-dayer i would be slower but not too much i reckon.
Not weighed it yet but supposed to be around the 15Kg mark.
The QUAD 2 suspension works really well, great traction & the fork is ace at the big stuff. With the U-turn & Motion Control it also works well on the climbs. Stands taller than the MV tho, my cods are hard against the top tube but that's to be expected when you're 5'2" with a 27" inside leg!