I have been running a set of dual dutys on m495s set up ghetto tubless. They did geat, wide foot print and stayed true. I got a promotion at work and wanted a set of real tubless wheels. I had a set custom built locally by Buzz: archs, xl14s, m775s. The set is 711 grams lighter. When I put them on my bike and picked it up I couldn't feel the 1.5lb difference. I went for a ride today not expecting anyting (since I couldn't feel the weight difference) but riding up the first hill I didn't have to shift to granny. Same thing at the next hill I was able to easily climb it in the middle ring. Not only does it climb better but it's easier to loft the front wheel and seems like it turns quicker too. I know people talk about rotational weight on here, but I never thought it would make that big of a difference. I am honestly blown away, they have completely changed the way the bike handles.