Not a Baron expert by any means, though I have flown all the basic models including the P and 56TC. The biggest quirk, that comes readily to mind, is the older Barons had a non standardized Throttle quadrant. If you have only flown a 172 in the civilian/piston world. I might suggest you get a complex/high performance endorsement in a single prior to tackling multi instruction, if a multi rating is the goal. You might receive better advice if your objective was clearer. At any rate, The Baron line are generally considered good safe aircraft; though any piston twin can quickly turn into a "Do it yourself, kill yourself kit" in the wrong hands... Also many pilots don't understand what a light twin is. It is a twin that is under 6 thousand Lbs., not 12,500. For practical purposes a light twin has no legal requirement to climb with an engine out.