I didn't have to provide an email address, postcode, or anything like that - just make up a name and password.
I found it very mixed, with some perfectly reasonable questions and answers. But many answers were over-specific, a good few were plain wrong. I often got the impression that they'd thought up a load of facts/recommendations/suggestions first and then tried to think up questions which led to them - and that can be a classic question-setting gotcha.
I found myself trying to work out which answer they were trying to get me to choose, in a few cases where all four answers were to some degree acceptable and none was uniquely correct.
And I stopped at "What extra caution might you note while riding a road bicycle on the road?" Extra to what? Extra to riding a road bike on a lake? The answer they gave as correct didn't actually justify any of those offered.