lfm
I usually do surveys from companies - if the root domain on form is the same as the company.
Not so fond of spreading my email/credentials to 3rd party.
But the survey a couple of months ago from Cake I did anyway - so important.
There are a total of zero questions that would identify you. It's asking how, how often, and what would you like next. (ok, that sounds a bit naughty, but only if you have a dirty mind...)
It's hosted by surveymonkey, they specialise in surveys. The most they could get would be your IP.