I used Transcenders for every test on the NT 4.0 MSCE track, but that was because the training center automatically supplied them as part of my tuition. I don't know if I would have purchased them otherwise.

I found them to be one of the most helpful test prep tools I had and I devoured them thoroughly before taking each test.

That was a couple of years back, so I can't attest to whether they are the same now, or how the ones for the particular cert your taking are. How's that for a disclaimer?

Good luck to you.