I've never had a problem with PdfXchangeViewer. I dumped Foxit years ago in favor of it...
I never had a problem with FoxIt
- it never installed a browser plugin. And I feel relatively safe using it, even if there's been a few exploits for it - I still don't think it has enough marketshare that there would be drive-by attacks for it anyway.
I've considered moving to Sumatra
, though, since it's opensource and even more lightweight and fast than foxit. It had some stability issues some years back, but I've been using it for primary PDF viewer on my work laptop for a while, and it seems to work pretty well nowadays...
Anyway, as mouser says, thanks for posting the security tips - it's good to get some focus on these things for people who don't follow security-related blogs & RSS feeds