i have the version that is one cheaper than the ace. i have really improved over the month that ive had it. (except the angles- but thats not the program's problem, i just cant see the differences to save my life). Its become what i do to give myself a study break from all the other crap on the test. Also, compared to other practice tests, the hole punches and angles are very challanging.
my only complaints:
-have to be connected to internet to use it
-can't rip it onto usb and move to other computers (as far as i know)
-a few objects are used on multiple tests, but used in different forms. for example, they may use the same object for the top/fron/side, question, but jsut have it flipped, or ask for a different view. the only time this becomes an issue is when your like five tests in, and you start to recognise some of the shapes bc of the repetition. i guess this is an issue with any study aid though.
if you have the money to spend, i say get it.