A long time FM user, I bought Bento when it first appeared. I felt it was too limited so never used it for anything. Maybe the current version is more functional, but I'm reluctant to waste more money to find out.
Although I've never used it, the biggest limitation is that it doesn't do mail merge directly. (There's a convoluted process they suggest but I wasn't interested.) If a database doesn't do mail merge, it's not of much use to me.