One nit with the typing test (which is the only thing I tried):

Lots of us were taught (correctly) to follow a period with two spaces. When you do that on your test, every single character from there on out is highlighted in red. It thinks you're wrong on every word, and there's nothing you can do about it short of backspacing to the period in question and erasing one of your spaces.

It pretty much makes the test useless. And since that's the only thing you let me see, the only inference I can draw is that the rest of your product is of similar quality. In short, you lost me.

Multiply that times everybody else who visits your site and types that way, and think about the impact it will have on your sales.