I have been with them for a year...
its hit or miss as to actually getting the survey.
Even though some surveys will ask you a bunch of questions.. leading to nothing..
some actually will come thru....
I, now.. just about delete all the ones that say its about 20 minutes or so... those have ended up being close to 40 minutes..
Ended up over the past year with quite a few miles... if I had the time, I could calculate the total miles I have gotten... .. no could not be bothered.