Good to see Stef's getting some love from the DW community. I've known him personally for about four years now and he's the main reason I started playing drums.
When I was just starting out, I mailed him asking for some advice and he suggested we head out for a drink and chat for a bit. Awesome down-to-earth guy, very supportive of everyone around him and a very talented drummer.
Stef Broks - Singularity playthrough
Stef Broks - Laments of an Icarus playthrough
For anyone interested:
Stef has left Exivious in (I think) 2011 and was replaced by Yuma van Eekelen of Pestilence.