I think Synology is still the way to go if you want ease of use. I've been a big fan of mine. I even upgraded to a newer version and the drive migration process was very smooth.

*edit*
I would never even try Drobo again. I had so many problems with it when I set one up for a client of mine. Absolutely miserable, and the client was so [understandably] frustrated that they pretty much stopped calling me. Every Synology I've installed has worked from the get-go and has lasted.