I don't do mobile or mileage tracking, so no comments there.
Quicken 2012 changed the screen you view brokerage account journals to where the entries don't fit on the screen, and you cannot adjust the column size to make it work. That's my only complaint with that version.
Quicken 2013 should be avoided if at all possible! I'm a power user of almost all software I own, and I cannot use it to do what I want. They've made so many things automatic, that if you don't fit their cookie-cutter definition of their user, you have to use quite artful and imaginative work-arounds. My particular beef is with Loans. If you borrow money, it is all automatic, complete with a pie chart of each payment with principal and interest. Oh, and this takes up most of the screen so you can only see one journal entry. Running a to-date schedule is a major pain. Now let's say you loaned a friend some money and want to record it. This is where you have to become imaginative. You no longer have the option to choose "I am the lender" on the set-up. You have to make TWO accounts, one for an asset and one for the loan. Don't ask me how it does payments, I don't know yet, except that you have to do it as a Memorized or Scheduled Bill, you can't just "make a payment". It also made Additional Principal payments part of a couple of my existing loans, which I had to edit out manually. I just had my nightmare with their chat customer support day before yesterday. An hour, and the only thing they could offer me was, if I wanted to go back to 2012, I could BUY support to help me with a re-installation issue. To quote a current TV commercial, "when pigs fly!"
On one of my installations of Quicken 2013, when I imported the previous data file, it did corrupt, but I closed out and imported again with much less destruction.
Quicken 2012 can be lived with. If there was another comparable player in the marketplace, I'd be switching from Quicken 2013 and not looking back.