I took it last week, ~3 weeks before my test. I think it was a good motivator because I've been studying (not intensely) since January, but only now I've had some dedicated study time and its draining.
The questions seemed super straight forward for the most part. Anything I missed is because I didn't know the concept well enough I think.
Interface is seriously something out of pre-windows 95. Even the little buttons in the interface remind me of pre-windows 95. The lab values are particularly annoying because when I see something is out of range, I like to highlight in the question, but you can't highlight and have the labs open at the same time.
I think it was a good experience though, really made me comfortable with the testing location, and shot my motivation back up.