Pros:
-- The obvious one, no OEI Vmc issues. For that reason they expected the safety record of the 336/337 to be stellar, but it didn't work out that way. Further proof that when man invents an idiot-proof system, nature promptly responds by producing a more resourceful idiot.
-- Great visibility.
-- Good cabin room for four, and easy cabin access. If you plan to use the optional third row of seats, get the external belly pod for baggage.
-- Good short/soft field performance.
Cons:
-- Cabin noise and vibration.
-- Relatively slow and inefficient in cruise.
-- Complex systems -- convoluted control rigging; complicated gear system. Bottom half of the aft fuselage disassembles with a lot of drag when the gear is in transit. If you lose an engine on takeoff before the gear is up, leave it down until obstacles are cleared.
-- Won't fit in a standard T-hangar.
-- Rear engine cooling issues. But the 337 (retractable, 1965-80) was better in that regard than the fixed-gear 336 (1964). The 336 had no cowl flaps; just a cooling intake on top and an axial exhaust fan attached to the rear prop shaft. The 337 had a redesigned top intake scoop (looked like an upside-down P-51), and adjustable cowl flaps.
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On takeoff the drill is to advance the throttle on the rear engine first to be sure it is awake. It's also tough to be sure the rear prop is clear when starting up.