I've been using successfully several 5bay Synology NAS units, and few Drobos (both Ethernet ad USB) for a decade, without any issue with either.
Synology is by far my favorite, due to its great OS and many features and apps. Drobo, however, is the simplest NAS solution I've ever tried, deliberately designed to almost only perform the basic function of storage, and do all the rest by itself. To anyone on this BBS I'd recommend Synology. To anyone who has no clue and wants to store stuff
, I'd suggest a Drobo.