The good: Overall, this is a decent little gadget. It's really bright, super efficient, and runs on AAA batteries you can get anywhere. Of course, it's not a spotlight or anything, but I would certainly say this flashlight holds its own against the Minimag's brightness. I would probably recommend this light if you are absolutely strapped for cash and need a pen light (but see below).
The bad: Well for starters, this light is not particularly well built. It's hard to explain, but it just feels hulky and cheap. The cap has a squeakyness to it that attests to this. Also, the clicky switch on the back is difficult to depress, requiring you to really dig in with your thumb to turn on the light. It's not the end of the world, but if you want a user friendly, well built light, the Stylus Pro may not be for you.
My second issue is that while running this light for approximately 15 minutes consecutively, one of the original Duracell batteries that it came with exploded. The battery was not expired, and was in the light for about a month prior, with intermittent use. It is entirely possible that the battery was the culprit, but I suspect it has something to do with the design of the flashlight since I have never had an issue with Duracells before.
I sent the light to Streamlight, and they promptly remitted a (supposedly) brand new replacement, which was DOA. At first, I couldn't even swap out the batteries since they were stuck firmly in the light. To make a long story short, I managed to pry them out using a screw and I found they were wrapped in cellphane, which caused them to become stuck inside. In any event, I tried new batteries -- to no avail. I also noticed that the reflector appears to have been warped and wavy.