I use Unified Stats daily and I like it. Very useful indeed, and as DangerDave says there are no security issues that I know of. The only problems that I am aware of is the updates aren't frequent enough, and it needs to support more sponsors. It's nice for free but you do always feel like you're missing a few things - probably because you are.
I haven't used Stats Remote yet but I will at some point. From what I've heard it's as good a DD says it is and definately worth trying.
