Now have about 150 miles on the new wheels, and while I'm sure there is some placebo effect, I'm liking them. Weather has been sucky with a lot of wind, so a little hard to compare. They do seem to have more pop to them and seem easier on hills. One semi-objective test, one of my rides has a relatively steep 1/2 mile downhill. I spin out, so I just tuck and enjoy the ride. I got up to 39 mph on the new wheels, which is faster than I've gotten before. The old wheels were stock Alex AT 450 with Tiagra hubs that came with the bike. Heavy, but I must say durable. I had close to 10,000 miles on them with no problems. I think the new wheels are about 1.5 lbs lighter (~2200 grams v 1520).