Linking To Mirrors & Penalties?

[Licker4U]

Originally Posted by LowryBigwood

I'm not saying building mirror sites is bad. I'm just wondering what others think about linking to mirrors and how the se's might perceive that? Could that cause a LL to be penalized for linking to them?

Penalized in what way? Lower PR? Not on the first page of results for certain search words/phrases? I know my new niche specific link list doesn't have a lot of sites listed but it has a PR3 after 5 months and if I read Awstats correctly 80% of my traffic is from Google (93% last month) and on Google's first page of results for several search words/phrases. Should I be concerned?