Super torn on using Mint.com. One one hand I really like the low-friction UI, automatically downloading all my transactions and categorizing them.
On the other hand, it won't accurately represent things like shared or business accounts, or easily let me mark a purchase as "reimbursable".
When things go wrong in Mint, it's mostly impossible to correct them. For example, Mint thinks I spent a ridiculous amount in April because my mortgage was bought by another mortgage company. It also thinks my real estate assets are 2x what they should be. I can't find any way to correct this in the UI.
Unfortunately, the alternative is to spend Sunday mornings once or twice a month updating Quickbooks and learning a lot about bookkeeping in the mean time.