Opinion World is definitely my favourite survey site, I am a member of quite a few sites and I really like this one.
I only occasionally get emails notifying me of a survey but regardless, I normally log on daily or every other day to check if there are any available surveys.
My favourite thing about this site is that when you reach 1000 (equivalent to £10) you can redeem it by using PayPal and it immediately deposits the funds into your PayPal account without waiting 10-28 days like some survey companies do. This makes it more of an incentive to complete the surveys as you know you are guaranteed to be payed your reward straight away. I have never encountered a problem receiving my rewards and they build up quite fast with surveys being anything from 50 points to sometimes 300 points. The surveys can be monotonous (like most surveys can) and sometimes I have encountered a problem on the last page of the survey and not been paid my points. I have contacted Opinion World when this happened on a couple of occasions and they have looked into it and put the points into my account
This is definitely one of the better sites to join