I pulled the trigger this week on the DS218+, got the 3xtra 4GB RAM and a single WD RED 6TB.

Once I got done fucking around with being able to see it on the network, transfers are a breeze. (Apparently, it doesn't like being plugged straight into the modem, once I put it on the router, it magically appeared....)

An Explorer-to-Explorer (through Windows) is infinitely faster than through the Synology Web Assistant. I moved 600GB that took about 5 hours through the assistant, and 1.7TB through Explorer in roughly 3.

Just need to get the Mac pointed at it, and I think we're good.