I have the 4TB Envoy Pro & the 8 TB Thunderblade. Both really work without problems, don't get too hot, and the 8 TB really almost is «on» around the clock. I don't use Softraid – I happen to think that a device with that kind of price tag should include a full version of a software it needs to run – but the Apple-Soft-RAID works just as well (and through various incarnations of MacOS!).
They co-exist with a couple of 2 TB Samsungs (for CCC-Backups), a 48 TB LaCie Big6, a 32 TB LaCie 2BigDoc and a 40 TB Terramaster without any problems whatsoever so far, really suprisingly solid (thank god!). OWC-Support here in Germany has been okay, not ideal, but workable.
The Terramaster, btw, so far turns out to be a GREAT alternative to the 2BigDock by Lacie, especially as you don't need Seagates iffy RAID-Manager, it just works with HW-Raid, supereasy to set up and so far works fine, cool to the touch, quite silent, 2x20 TB disks are no problem – I was really suprised/impressed. Also beautiful pre-sale-support online that really answered any question I had, which kind of has become the exception to the rule.
Both OWCs have been ideal for FinalCut and PSD/Lightroom stuff and also Dropbox so far, not nearly as quick as Apples internal M1Studio-Flash, of course, but the RAID makes the Thunderblade really as fast you can wish for with external these days.