I've been using it daily for a few months and haven't had a single issue. Perhaps the server load also went down when they introduced the pricing. I do download my data every few days or so just in case.

Personally I'm not a fan of the company, culture, and the cult-like following Roam has. I hope somebody else succeeds and takes over the market and I'll move there. But so far roam is the best life/knowledge management app I've used, and I've tried a lot of them.