I recently bought a 2012 Burton Custom with the Custom EST bindings on it as well. I'm used to the stiffest stuff Burton makes, so these felt really weird to me. The foam cushioning underfoot is really thin, the bindings really flexy. The ratchets worked fine as all Burtons seem to work well, but the other parts of the binding wouldn't lend me to thing they'd be good for my long days.
I'd probably pick something up a little more mid-range (like Missions, Cartels or Malavitas) with the deals on now you can pick them up relatively cheap.