It's upgrade day!
I've been limping along on a TS-451+ (4 2TB drives) with a TR-004 connected (4 4TB drives). It's been running 24/7 for 9 years. I had no idea what I was doing when I set it up and everything is a mess. I also bought them at separate times. There was no planning here. I moved over from a Drobo (remember those guys?) which was pretty much hands-off.
Just arrived today - TVS-h674 with the Core i5 and 32gb. On the way are 6 16TB drives. Then comes the fun but frustrating part of migrating everything over!
UPDATE: disctech called me yesterday to say they didn't have enough WD Red Pro NAS drives at $336 but had WD Ultra Star datacenter drives at $399 each. Then they called me today to say their supplier can't deliver the WD Ultra Stars but they have Seagate Exos for $499. However he honored the $399 price to get this fulfilled. Personal calls back to back and really understood the use case. Love this level of service and excited to get. Exos drives on the cheap.