Love e-Rewards. I am able to cash in monthly for SW points, usually $50 but sometimes $25 or $100. Like a PP, I find I qualify for a lot of them because I am in a decision making position in a small business. I make enough for more than a one-way ticket each year so it's worth it.
I always try for every survey. Usually, if I don't end up qualifying for one, it will tell me I have another survey available so it is worth trying every link. I don't think I would have gotten a separate email on those additional surveys. Plus there is the token amount just for trying.
I love the ones where I get free products to try. I was disappointed once when I was in the middle of one where I was going to get free body wash but I got called away. The wifi connection quit in the meantime and I lost the survey.
I tried e-miles, finally got to 500 points, cashed in, and quit. It was so slow.