Since there were a lot of requests and I had some time to spare, here they are:
Some notes: On Sparc, the system resources aren’t quite up to the task when being confronted with OwnCloud. So you need to have a lot of time on Sparc boxes and I would strongly advise against using the picture gallery feature.
Also please note that OwnCloud requires some special settings to the XCache PHP accelerator. Naturally the OwnCloud add-on will make the changes for you. But should you ever re-install the PHP add-on, those changes will be lost and you either need to re-install OwnCloud as well or make the modification to XCache’s config file manually.
That said: Have fun with your ReadyNAS