Not OP, but got the same laptop. "Jumpy trackpad" [1] and "stuck key" [2] problems are the ones I feel most.

They should have been fixed by the latest firmware (apparently still in 2015) but I can still experience them sometimes. I believe I have the latest fw (I'm surely >= 06A), but can't check ATM, so chances are I'm not on the latest. Then again, I admit I can work with it almost seamlessly (dev-work from CLI mainly).

[1] http://en.community.dell.com/techcenter/os-applications/f/46... [2] en.community.dell.com/techcenter/os-applications/f/4613/t/19637021