You mean "for you"? I don't think it's universal, I've got the free trial a couple times, and I did not consider the service to be worth the asking price (to continue the service).
Too many products don't qualify, and/or you can find them cheaper non-Prime. So you sometimes pay twice, or end up paying for a service you don't get to use. And, for me, the two day shipping is hardly ever an issue - for the times I might really want it that fast, I could pay for shipping and be ahead.
I've been buying some more stuff through the third-party Chinese sellers at Amazon or ebay. Incredible prices, shipping included on even very low cost items. Of course, I end up waiting weeks, maybe even over a month - but for some of this stuff (spare parts, future projects), it just doesn't matter.
The 'free' (you meant 'included in the price', didn't you?) music/video isn't something we've used more than twice - Netflix suffices, and some of the stuff on Netflix that DW watches isn't available on Prime, so dropping Netflix isn't in the cards... for us.
And again, it bothered the environmentalist in me a wee bit to see a truck making a special delivery on a Sunday for something I didn't need on Sunday. As they say on "Shark Tank": "For all those reasons... I'm OUT!".
Of course, if you think it's worth it for you, that's great for you. I just am not a fan of these 'universal', 'one size fits all' statements.
Better service reps?
-ERD50