I use my mandolin several times a week. Since I use a dehydrator, getting uniform slices really helps with uniform drying times for various fruits. After trying a few different mandolins over the years I've found I prefer a slicer that can be kept in the utility drawer and doesn't require any set-up. I like the Progressive Intl Adjust-a-Slice Mandolin & Julienne Slicer. Since it fits so nicely in the drawer I'm more likely to actually use it.
I think the key to success with a mandolin is getting the thought "I bet I can get one last slice", out of your mind. Use a guard or a cut-proof glove.