I got my wings in Corpus. I sat in those sims several times wondering exactly what the Navy's fascination was with the "Microsim". FYI, those Microsims were not a portion of the Navy's actual syllabus. They provide them for studs to use on their own time.
IMHO, they were useless. The instruments were hard to see and 99.69% of the studs sitting at the consoles were just goofing off and doing barrel rolls between buildings in downtown Corpus.
I'm not trying to talk you out of buying anything, I'm just giving you some insight. The most important thing to prepare yourself for UPT is to practice the boldface and ops limits. After that, If you think a computer game is going to make one bit of difference in UPT, then have at it.
Take it for what it's worth.
HD