Cheaper ? Not sure.
More reliable and faster ? Most certainly. Synology.
I had a Drobo for a year, and it ended in near-disaster.
Only after months I was able to recover most of my data.
Returned the Drobo, and got a Synology. MUCH faster, feels more reliable. If you do some search online, you'll find that Drobo's are not as stable as they make you believe.
-t