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Edit: Also, you should make sure that what you want to watch is actually included in prime instant video. I think you still have to pay for the latest myth busters seasons even if you sign up for prime.
This
I did the free trial of Prime back in February and there was no free streaming of
Mythbusters episodes. It was pay only. I refused.
I had to ask myself "What do I get for $79?"
Free shipping? Yeah, but most (maybe all) of the Prime-eligible stuff
also qualifies for free Super Saver shipping for non-members anyway. Where's the membership advantage?? Granted there's a $25 minimum order total.
Instant streaming of movies and tv shows?? Technically. They're free for a reason though. Turns out, of Prime's "Instant Video" freebies I only found 2 tv shows (+ 1 movie) worth watching. You have to pay for the good stuff. YMMV
Book borrowing? Who does that?? Kindle my ass.
Two-day shipping?? Depends.
Not when I order just before or during the weekend. Factor in the weekend and 2-day shipping stretches to 4-day shipping. Frankly, occasions where I can't wait 7 days to receive my purchases are few and far between.
I also asked myself:
Am I buying things I ordinarily wouldn't? Sometimes. Got to recoup that membership fee, right?
I probably average 3 orders/month. After adding all the above together I realized tangible Prime benefits were negligible and personal profit was zero.
So I cancelled once the trial period expired.