Going to SaaS can be quite an issue depending on the reliability of the company developing the software. One of the company I'm dealing with as a reseller had the bad habit of delivering releases with semi-critical issues and even regression bugs, consequently with my colleagues we decided to act as a buffer, doing a pass of QA ourselves, and depending on the results making the versions available or not to our customers. Sometimes it took one year before getting an good enough release. Quite annoying to do this ourselves, but at least our customers are satisfied with the quality.

Now a year ago the partner decided to deliver a SaaS version, which made completely sense commercially. Then the SaaS became public a month ago and we keep encountering critical issues, like features not working, translation files older than the last on-prem release, or even impossibility to log in because somebody installed a patch and never checked anything after (and never told us about it either). But this time we cannot buffer anything, so they are basically shooting themselves in the foot.