Quick reply: No, Plat isn't worth it. No major difference from Gold. I've been Plat since 2008 and probably get upgraded 10-20% of the time, at best. I haven't even hit the required nights for Plat the last 2 years, but Marriott keeps renewing my status. Hell, I didn't even have enough to qualify for Gold last year, and they still sent me the Plat pamphlet in the mail. Been spending more time at Hilton properties. I'm finding them much nicer and with better rates. Marriott has been going downhill for years, in my opinion... Of course, your experience may differ.