OK I have been using this site for over a year now and I have had 1 cheque from them but I also have enough for a second cheque soon, the surveys are very hit and miss and I just avoid them as they generally end up being dead end but I have never seen surveys as viable on the internet.
The way I use this is to just run my cash searches which gives me 15p per day guaranteed and you get a loyalty bonus for searching using them for 5 days in a row. I have also referred to friends who use it as well. I did have a minor issue with my first cheque as I put the wrong address down, took about 3 weeks to arrive but I guessed that would happen.
15p per day works out at £54.75
Things I would never do
1. Pay out any money for products (Ever)
2. Give any bank details out
3. Use their surveys
4. Sign up for any casinos or gambling sites
But generally I think this is safe money for free if you could use a few extra pennies. I think use common sense with this site and you will be fine.