I love the zone; in fact, it's my favorite defensive set. I like the stamina boost. I would definitely say that the same players would be slightly more effective per minute in a man defense, both in terms of a slightly better defensive performance as reflected in Opp %s and rebounding. But I love the fact that I can run mostly uptempo some seasons and still get 28 or 29 MPG out of guys with 85 stamina. This season we have a losing record, largely because I played the #1 SOS non-con (4 of the teams I lost to ended non-con undefeated) and have only 4 upperclassmen, only one of whom is a senior. Some of the young guys are going to be really good, and I expect there's a good chance of this being a top-10 program again as early as next season.
Back to my main point, the problems I have had this season have been almost exclusively on the offensive end of the court. So far 16 games into the season against the #7 SOS to date I'm outrebounding my opponents by 3.1 RPG and holding my opponents to .415/.317% shooting. I'd say that's indicative of my zone defense being very solid and not overly hampering my rebounders (who are certainly very good).