I'd advise against it, personally. I was tinkering around with it and installed 2 users. What I've found is that it's horribly screwed up the tweaks I had in place when switching back to the primary (admin) user - still working to try to get everything back in shape. I removed the app, and other tweaks such as NoLocksreen won't get running again. I also had some minimal theming going on - icons, etc. and those are no longer working even though my custom theme is selected via WinterBoard.