Mando is just different enough to be confusing, but it's a blast to play. I have to use a different picking grip, a different pick, and attack the strings differently. I didn't really start to progress until I stopped thinking of it as a baby guitar.
If you're in the market for one, as Andy mentioned, there are some decent PacRim starter instruments; if you have the green, get an old Flatiron pancake model from the '80s or '90s. Flatiron was later acquired by Gibson, things predictably went to shit, and the original employees formed Weber, who currently make some really top-notch mandos. Here's an old Flatiron on the 'bay.
http://www.ebay.com/itm/Flatiron-Mo...804?pt=LH_DefaultDomain_0&hash=item2c61b410fc
I have one from '85 that sat in my closet for about 20 years, where it developed a nice crack in the top. I never really believed that nonsense about instruments "opening up" by being played for a while, but holy crap it did when I brought it out and got serious. I have no plans to fix the crack because it sounds awesome. Toan is in teh cracks.