Another long term Areca user here. Very satisfied, obviously.
I have a 7 x 6tb internal array, in my main PC workstation. And two external 8050 TB2s for backup. One is kept off-site that I rotate about monthly.
Yes their interface is slightly clunky, but boy do they deliver in speed, reliability and pro features. It's not a 'prosumer' product, it's true pro. I use HGST Ultrastsar HE6 drives for reliability.