Upload & Sell: Off
Here is another vote for Synology.
I have two different Synology NAS systems and they work great. I have over 30 years experience in the high tech field, so know a thing or two about NAS and other storage mechanisms. After doing my research, I selected Synology and have been very pleased. Reliable, easy to manage, easy to maintain, etc. I have had to replace a failed disk in a RAID, and it was pretty painless. I have also had to expand a RAID by replacing existing disks with larger ones. Again, pretty painless.
I have been using Synology NAS systems for 2 or 3 years and never had a need to test their customer service.
There are other good solutions, but for my money, I have been really happy with Synology.