Just built up an Atlas. Although I don't have time on a 429 I can tell you the Atlas is a great ride. I think weight is pretty similar. My medium Atlas frame is ~6.5 lbs. The suspension is plush but feels efficient with no noticable bob. The short chainstays make it feel flickable like a 26" bike. The only complaint I have is I wish it was anodized instead of painted. I have a feeling the paint will chip pretty easily. But I also paid a ton less than what a 429 would have cost me so I can't really complain too much. get one!
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