I've already got a Synology. But I use it for more things than Channels DVR and no longer have Channels running on it (I do use it for media storage though). And so was originally thinking about waiting for something like a DS922+ to come out and put 4 drives on there in RAID 10 to do more things + Channels. And back up to the older Synology. But that was until I started looking at QNAP. They make rack-mount servers with Intel processors and there is a new one about to come out, the TS-464U that looks great. I want it. I will probably still do RAID 10, and run rsync backups to the Synology for anything that is not Channels recordings (I don't really care about backing that up).
So I wanted to see what experiences users here have with QNAP, if its a good server for Channels, and any other things that you do with it.