I recently had a set of Crests/American Classic hubs/Supercomp set for my 29er HT built up by Larry at Mountain High Cyclery.
Primarily a race day set for endurance races. I'm a bit over 170 lbs.
Total weight w/ yellow tape (but no valve stems--Larry was out of stock) = 1522g
This is my first go with American classic hubs (and Crests for that matter) so I can't speak to the long term durability quite yet. I have had quite a few sets (both MTB and Road) built with 240 hubs and they really are a fantastic hub.
For an all around training/racing set I would personally go with the 240's. My everyday training wheelset is a set of Arch/Supercomp/240's
The only reason I went with the AmClas is I wanted the lightest wheelset for race day only for my weight.
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