I've been a ViprVPN customer before. I had a question or perhaps it was an issue I called them about and the person I was communicating with told me what VPN server I last connected to and when I connected. Sure, to do any kind of troubleshooting, this would have been necessary and important information. But I was concerned enough about the unsolicited disclosure that I cancelled the service immediately.
DuckDuckGo can claim a reasonably high interest in protecting my privacy because they simply do not collect data that the big search engine does. Collecting and storing this data would make them a target for undisclosed, unchallengeable, and unwarranted surveillance. This has enormous appeal to me.
Having said that, have you guys discussed (loosely) what data you will be collecting?