I can offer this from my brief experience with twins so far:
With both engines running, they fly just like a normal airplane......

I have not had anything but a perfect experience so far...

I have to admit that my knees were knocking and my ears strained to hear both engines at all times. My only contingency at this early stage in my twin career is to stay high, and be ready to throttle back if an engine goes to sleep.

I'm installing my computer radio this spring with separate channels for each throttle so I can experiment with simulated engine failures under very controlled conditions.