I just picked up the 60 sub card. I hadn't played TOR for about a year, and reinstalled yesterday.
I went bananas. I forgot things, such as you can't even send mail without being a sub, and the prices in stores are 2x as high. A speeder I'm looking into went from around 13K or so down to 8, just when I became a sub.
Not to mention, you can only have 2 character slots, the stunt of exp