I'm sorry if this has been asked before, but my google-fu is failing me.
There are occasional hints that heavy armors increase the difficulty of some checks, especially stealth. In particular, attachments that improve stealth often have comments in the fluff that say they don't work as well on laminated or heavy battle armors (or is 'nearly useless'). However, I can't find anything in the armor descriptions or skill descriptions that say this.
So... I'm seeing three possibilities. First, and probably most likely, is that I've simply missed a few lines that explain how armor affects various physical checks. Second, it's just up to the GM, and he can add setback die as appropriate when I try to sneak around in my powered armor. Third, the lines in the attachment descriptions are just fluff, and should generally be ignored.
How has everyone else handled this?