Well set out site, very easy to navigate, you can even choose the colour of your homepage. A big advantage of this site is you can claim your reward at only 345 points which equates to £3 paypal.
I tend to cash out at 575 points which is £5 paypal but that is just personal choice. You can also get Amazon gift vouchers. This site sends you plenty of surveys and does not screen you out too often.
IpsosThis is another survey site that sends lots of surveys and with which you can cash out quite often. If you become a VIP you are given access to more survey opportunities. To become a VIP all you have to do is complete the surveys sent to you regularly. Only one account per household is allowed but quite often they will send surveys to completed by other members of your household ie. there may be a survey specifically for children. Again payment is in the form of gift vouchers. 1380 points will get you a £10 gift card. If you would like to join please email me at firstname.lastname@example.org, I will get a extra 100 points for referring you.
You Gov send 2-3 surveys a month. As you can only cash out once you have reached £50 it takes quite a while to accumulate. It usually takes me between 12-18 months. Despite the long wait for payment I still like this site. It gives you an opportunity to give your views on the way the country is being run. On the YouGov website there is plenty to do, you can complete Opigrams which are little surveys about anything and everything you are interested in. You can also comment on day to day events in the news & parliament.