I don't see any reason it wouldn't be fine, but haven't touched one myself that I can recall. You should be aware that the chassis has multiple versions, including some
without redundant power which should be much less expensive - maybe by 25% or more.
Be aware that there's a newer version of the E3-1230v3 called the E3-1231v3, which may be a slightly nicer part. The X10SL7 and E3-1231v3 combo is very popular here.
The Avoton parts are also competent, but are about half the
CPU power (Geekbench ~6000) of an
E3-1231v3 (Geekbench ~13000). The Avoton's a fine choice if you know you don't need a massive fileserver that is also running other services like Plex video transcoding. For basic fileservice, that's probably the way to go, and that seems to be what you're after. The E3 route may be a little more expensive, but it will also leave you with a lot of potential to run a virtual machine or some jails if you ever decide you need some other services running 24/7.