Not too recently i switched to a 34T from a 414m2, and so far i have found it to be a faster chassis. Im running it stock on a medium sized ozite track.
I do somewhat miss being able to adjust the height and angle of the arms, but i have found the atlas suspension geometry to very comprehensive.
I have also found the drivetrain to be quite a bit more free than the 414. I think this is due to the alum hubs and the perfect size belt.
As far as weight. The running weight with a transponder is 53oz or 3.58lbs and with only TI tierods it is 3.60lbs which is very good. I have been going through it with some TI screws. I also have the oneway diff with the OS 6mm outdrives, and I do not have the delrin diff installed.
I like to have the suspension setup with a stiff rear end and soft front end for maximum on power steering, and the chassis seems to respond very well to this.
Ive owned large number of different chassis, and I so far like this one the best.