I have 3 Synology NAS' and I love them. I'm doing more with them than you would want (it appears). I am a huge fan of things that "just work" -- and these Synology NAS' have "just worked", without headache, for everything that I wanted them for.
Side Rant: My one gripe (and it really peeves me) is how Synology handles Surveillance Station licenses. Each NAS comes with 2 licenses to Surveillance Station -- so 2 cameras. Why would I have to buy licenses for additional cameras for a piece of hardware and it's accompanying software that I already bought into and own. Additionally, I have 3 NAS', therefore 6 licenses I'm entitled to -- but I only want the cameras on 1 NAS. Why can't I move my owned licenses around between NAS'? Grr.