The first time I'd ever laid eyes on a bike from Opus was a couple of weeks ago when I popped into a bike shop close to my cottage up north. Opus is based in Montreal and isn't as well known as Cervelo, Argon18 or Norco. There aren't that many dealers outside of Quebec and Ontario. The bike I was looking at was a cyclocross bike

http://www.opusbike.com/en/bikes_5_33-66-sentiero.html

It had a sort of frankenbike collection of drivetrain components with a mixture of Shimano Tiagra, 105 and Ultegra (or so the sales guy told me although I didn't see any evidence of any Ultegra components anywhere). It appeared to be a pretty decent bike with a nice fit and finish. The price wasn't bad and seemed to be pretty competitive with the other bike makers and all the other components were pretty conventional for that price range.

The 2011 Alto is full carbon and appears to have a fairly agressive geometry. I'm not sure if that's something you really want but the only way you'll find out is to give it a test ride.