C310R
AC-DC is correct - undercarriage problems are not unknown. My business partner had a share in one that suffered 2 gear ups as a result of microswitch problems (apparently).
On the other hand, he and I used to own a 310Q and we never had a single problem with it. It was fast, had a lot of useful load, and good single engine performance. Expensive to run though and Eurocontrol will catch up with you IFR, which adds to the cost.