I wouldn't chance it - unless you can get it to a dealer and get a diagnosis and histroy. It's possible that the well documented gremlins as discussed have been taken care of and once the gear shift is fixed, you'll be fine. However, that's one heck of a way to start your new journey with your ride. Seven years old, your dealer already telling you anything else is on your dime, current known problems, unknown history, potential unknown additional problems... If you keep it, be prepared to pay.