I have heard or read maybe here that one shouldn't have aero bars without shifters (for safety I guess). Is this correct? I am wondering if I should outfit my bike with them for this coming season. It is a regular road bike, so I don't think shifters would be an option. Also, I would still be nervous using them, is there anyway to get used to them beforehand?

The only reason I am entertaining it is because I have been 'trying' the position in spin class/trainer sessions, and I kind of like feeling hunkered down.