Having reviewed this from all directions I jumped on the basis that it was likely to save me in the long run. While that day remains in the future I've got the peace of mind that no matter what there are little snapshot backups I can use when needed.
It was simple enough to deploy and while I know things like the dashboard will evolve with time, so far it is ticking away as the tool you need. That's its purpose, it is a tool, a specialist one, for those special hopefully never instances.
For those of us who have had to debug seemingly random issues I know it would have saved me the purchase price many times over.