Not me, but I can tell you that, for me, just the default apps, a To Do app, and you are WELL on your way. I love the built-in calendar and contacts apps.
Goldeneye, I have bento on my Mac, I like it but didn't download for iPad. I don't really see the value for the iPad. If you use the included apps, it will sync your contacts if you have a Mac. Bento updates also but unless you need more database functions the included apps and the way they sync works great.