I was skeptical, very skeptical, even after reading all the positive reviews. I have a 1977 F-250 that I have lovingly restored (in other words poured a ton of money and time into), it developed a leak somewhere and I was loosing coolant. It wasnt leaking onto the ground so I figured it must be going out the exhaust. I just didn't have the time to tear down the motor to find the problem. I purchased this product out of desperation and honestly thought I had waisted $65. In my mind this kind of problem just can't be fixed this easily.

I don't trust AVG PC TuneUp. I installed their trial version, and it interrupted my work numerous times daily, plus on every boot-up, to buy. When this continued long past the trial expiration, I went to their site and got the "downgrade"...which did nothing to stop the annoying pop-ups. Way to be classy.

I wish there was practice problems in the math section, but otherwise a great book. I passed the 1st time taking the test! YEA!!!