We are currently too nervous to put our site live on Sitefinity 4 (4.1.1501.0) because of the number of serious bugs that stop us doing fundamental things like editing Pages, publishing Pages, and managing content (such as taxonomy). Right now our site is still live on the previous open source CMS we were using and we're miles behind schedule.
I want to love Sitefinity -- and sometimes I do when it works. I also have to say that the technical support is mostly excellent and very responsive (thanks Victor, Boyan, etc). However, these are just a selection of the problems we've had:
2. Unable to Edit any Pages because of this MasterPage problem
3. Unable to Edit any Pages because of a bug (error reads: "Cannot insert the value NULL into column 'is_backend_object', table 'SentoriSF4SP2.dbo.sf_object_data'; column does not allow nulls. INSERT fails".)
4. Unable to delete Tags because of this bug
We've not even started any serious development work to integrate Sitefinity with our own software, this is just very basic editing of content that is stopping us. Right now, I can't hand the system off to users because I know they are going to have problems.
Are we just desperately unlucky or are other people struggling too?