If there's a changelog I'll read it. If a changelog isn't supplied then I may hesitate in using that Plugin/Theme in favour of another similar Plugin/Theme that the devs have been proactive to include a changelog in.

A Changelog included in a Plugin/Theme indicates the developer is being transparent, and has a higher level of work.

Backup 1st, update, test, retest, and Leave Feedback.... until the next round of updates... and lately it's been crazy :/