Fantastic site!! I love the quotes that are on here and that the typists are the one who contribute them. I have been typing on here for about a month now and have increased my WPM from 85 to 102. Only site I still use to type on.
Although I personally always fix mistakes no matter what, I like how it lets you finish it without fixing everything. More choices is always good. And it is nice anyone can add a quote, but that is also why it can often be bad.
I use this site a lot, but I use typeracer if I truly want to measure my speed and test myself. That site prevents myself from restarting every time I make a mistake as you are put up with other players, and because of the more strict quote choices, the testes are often more legitimate.