I've pushed mine - probably too far, up to as much as 3000 and beyond. It took it for a while, but has developed noises over time, and I've backed off again to 1800. The noises are lessened there, but still present.
I seemed to have one of the lucky ones from the start, that was very quiet and never had any issues, so the sounds now are disturbing. Once I've got the Kossel finished, I'll look into belt tightening/pulley replacement/whatever might be the source - but it still prints fine even though it's loud now and I like to keep at least one running, to support repairs or mod work on the others 
I don't advise going beyond about 2400 very often, if ever.
Edit: To be a little more clear, after S3d's upgrade to 3.0, I've left the speed settings at the defaults, which does have movement set to 3600 mm/m but the max printing speed at 1800.
Don: Folger Tech 2020 Kossel Rev A + Borosilicate + Snow Effector
Davinci 1.0 + Repetier : Filastruder
SD3 + RAMPS + Lawsy Carriages + E3D + Borosilicate + ... : Cupcake