I hate these pop up surveys. I've had a couple when using this site on my PC and I usually leave any site immediately if I get hassled to complete a survey when I'm looking at a website - it puts me off looking and gives a bad impression. Giffgaff please take note!
The worse network website at the moment by far is Three's website. It asks if you want help then after several minimises it still keeps popping up.
Pop up surveys and such things might as well say "we don't want you to look at our website, we want you to spend several minutes telling us what you think of our website without giving you a chance to look around". #LostCustom