Not worth it IMO.
I got the premium maintenance plan for free with my truck because Ford dropped the ball on getting my order through in a timely manner. They gave me a maint plan free to make up for it. I've had my truck for 3 years as of next week. My maint plan was for 3 years 45k miles. Well in the past 3 years I've put on 34k miles and I've used the maint plan for 7 oil changes, 1 air filter, 7 tire rotations, 1 set of ****** wiper blades, probably a gallon of washer fluid, and 1 set of front pads, and turned front rotors.
So the equivalent cost of what I got out of it....7 oil changes, figure $50 a change between oil and a filter is $350. Air filter just a cheap paper one say $20. Tire rotations don't cost money. ****** wiper blades $20 (they weren't the OEM style, they were the cheap shit metal ones), gallon of washer fluid $2, front pads and getting rotors turned $100? So I got about a $500 value out of it and didn't have to do any work myself. But I bet they would have charged $1,000 or more for that maint plan.
How much is the maint plan you're looking at? Just estimate what you think you'd need to have done during that time, and if you'd have to pay someone or do it yourself. I do all the work myself usually so it only saved me parts costs. Didn't really save time because I still had to wait around for everything.
Oh and I only was able to get front brakes out of it from towing with my TBC off the last few times to try and get the pads down enough lol. They just squeeked by the min amount to get the free replacement before my plane expired.