The only showstopper type problem with the 5.0.1 has been the issue of events 'disappearing'. There is problem listed as major to do with the perfoamnce of the module when a recurring event is added which generates 1000s of records (e.g. weekly for 50 years = 2600 records) There are other minor bugs which you can see listed here.

Any new records added will be fine.

The module as far as I know will function fine, though I can't be 100% sure in every case. The fact that you appear to be able to add/edit/view new data indicates that everything is fine for you. 'Fine' is as always subject to the fact that humans aren't as yet perfect coders, they make mistakes. If you can provide some information against the questions I posed earlier in this thread, I can give you a more concrete answer.

Assuming everything is installed OK, upgrades to future version will work.

Roger