Using IS on the lens for handheld video

Has anybody else been successful with actually turning on the IS on the lens when shooting 5dmarkii (well, it should work with any Canon, really) handheld?  Just wrapped up our second music video and trying to be objective here, but would love some feedback from the pros.  Obviously trying to get higher production quality so that when it's time to do mass footage uploads my stuff can be better and better, but I just really can't invest into stabilization equipment right now and IS seems to be a godsend that almost no one ever talks about.


What do you guys think?  Here's the link:  https://www.youtube.com/watch?v=8FEk57yuzyQ  So, basically, this was a tripod, a 3-foot slider and then just the 28-135 IS lens.  Totally looking to your guys' feedback.