To be totally up front I was asked to do this review by the company uCertify.com, but I won't let that affect my opinion of the product offered.
The download and installation of the product was straight forward. They even offer you a chance to do some practice tests for free to test out the software. The test itself is inexpensive coming in at $49.99 for a single user. Not bad in my opinion. So far I have only gone through the 15 question diagnostic test once, but the questions where challenging none the less.
I will be using this practice test for my 70-284 exam to truely test it out and to be honest I think it will work. I have to go through all of the exams first and then start using the "Adaptive Test" to really hone in on areas I have trouble in. Also the custom test allows you to pick areas of the exam that you are really struggeling with so you can "turn your weakness into stenght".