The Microserver Gen8 can be a better solution than the offerings of - for example - Synology or QNAP because you can create a more reliable system based on ECC-memory and ZFS. iLO (KVM over IP with dedicated network interface).The Microserver Gen8 has nice features such as: The benchmarks I've performed seem to confirm this.
I think the HP Proliant Microserver Gen8 is a very interesting little box if you want to build your own ZFS-based NAS.
