I've been using a Las Cruces for triple duty and It's great. Having disc brakes for a rainy commute is a plus. The first CX race isn't for another 3 weeks so I have only tested the bike in the dirt a little. On the road I do notice the more relaxed geometry. It does not whip into corners like my road bike. The last couple of weekends I've been doing some hilly century rides and the bike has been fairly comforatable.
i have no personal experience with the las cruces, but i hear nothing but good things about them and i see lots of them at the cross races. it seems like a good deal for a scandium frame, and if you are used to steel, supposedly the scandium is more "forgiving" than aluminum.