I have had my Beasley now for six months and the more I ride this bike the more I love It! It is more responsive in the twisties than my Ol' Karate Monkey. Feels more natural than the Gary Fisher Rig (G1). and it still rolls better than any 26" I have had.
I have done some upgrades, The wheels had to go, they really didn't want to stay true, but now I am rolling on some Phil Wood hubs laced to Velocity Blunts, for power I am running a White Industries freewheel. I also swapped out both the Ritchie seat post and headset, the seat post kept tilting and the headset was pedestrian at best. I installed a Thomson Elite for a post and a FSA Orbit MX for the headset.
The next to get switched was the brakes, the bb5's are fine but I prefer the adjust ability of the bb7's, I also went with 185 rotors just to be obnoxious. For grips I am running Lizard Skins Moab. The WTB saddle was comfy but I swapped it out for a Brooks Swift. For pedals I chose Crank Bros Mallets. I call this bike my Armageddon build as I went for durability with most of the parts.
Like I said I am really enjoying this 650b bike I don't see it taking the place of 29ers but as a nice compliment. But it is a great bike at a great price way to go haro!