Kind of underrated. As a GS fan I've seen it quite a bit the last few years because Nellie and Mark Jackson like to utilize it. Obviously if you use it a lot its probably a sign that your team isn't very good on defense (or at least many of your players are poor individual defenders). That said, sometimes its just a smart decision to implement IMO. You'd be surprised how effective it can be just by disrupting a team that's gotten into a rhythm. It worked very well for the W's against the Nuggets. Their shooting wasn't so hot with Galinari out and GS did pretty well keeping them off the glass. IMO it could work pretty well against the Grizzlies because they don't shoot that well either, though Gasol could be a bit of a zone buster operating from the high post.
