The component would be awesome if you could add custom forms/fields when adding events and if you could disable the registering for events. Some people just want to show the events and not allow people to register for them.
So for me it's 5 stars for service and 3 stars for the component.
I did encounter a CSS issue causing the hearts for the rating to be misaligned and right after installation the folder permissions were not set correctly, so the vote went into an eternal loop. Tiny issues really as you can expect these with most components when implementing them in your website.
The plugin itself looks and feels really slick and makes a very good addition for any site.
Furthermore, a forum or some other place to discuss bugs rather than this review section would be nice. I didn't give a score yet as it's still a beta.
As on request a forum is in place on the support site
For the CSS part look at the documentation how these are organized
If you want to add multiple or non Joomla databases, just make sure to add an SQL user to be able to read the forum database and all you need to do next is select the extra databases you want in the Xcloner configuration...PRESTO!! Automation of backups comes through cron and I did have some trouble setting that up, but that was not Xcloners' fault, it was my lack of knowledge on cron. The documentation could be a little more newbie proof on that end perhaps.
Another neat little feature to mention is the button to exclude the backup folder from your backups without having to configure excludes manually.
Right after I installed the component, I did run into an error, but this was resolved very quickly by the author after I sent a ticket. I sent this in the evening here in Canada, and he replied in a couple of minutes, it must have been late in the night in Europe so I didn't expect an answer till the next morning, so again....hats off.
All in all, highly recommended for Joomla and non-Joomla sites.