I've had the same questions, as I need to update my storage generally.
I'm coming to the conclusion it's NOT worth the money. Especially when the best price in the UK (Amazon.co.uk, of course) is nearly
£1100! Which is quite frankly utterly ridiculous for just the box (doubly as silly, as I could actually order it from Amazon.com paying the shipping and import charges and save £150!). By the time you add 8TB or 10TB drives, the cost is silly. Add that the USB-C version of the unit (the one released a few months earlier that has the light blue frontage; which I wouldn't buy either as USB 5Gb/s is pointless, only useful for an on-the-fly DAS connection) sells for
half the price; so you're effectively paying
double the cost for this pseudo Tbolt 3-over-Ethernet connectivity.
- Firstly, on price.
For that money you're pushing into DAS Thunderbolt RAID territory. Go onto Ebay, and you can see loads of Promise Pegasus TBolt2 units available, that will give you faster connections, usually going for less money by the time you include the drives. And AFAIUI, any DAS RAID connected to an always on Mac effectively makes it a NAS in terms of connection, provided file sharing is enabled.
- Secondly, connection speed.
Go to Youtube, see the video where Span.com's "Robbie" tells us the speed to expect at best is only ~300MB/s read/writes. That's compared to ~100MBps on plain 1GbE NAS connections. So yes, it's 3x faster (at least in theory: but who knows how that speed sustains over time?), but is just THREE times faster worth the large mark-up you're paying?
Personally, I think 100 vs 300 MB/s makes a marginal difference in everyday usage. It's not very exciting is it, in a world where a Pegasus TBolt3 RAID will give ~900-1200MB/s, or at the extreme, where SSD/PCIe solutions are offering ~2500-2800MB/s, like the OWC ThunderBlade V4. Obviously they cost more (sometimes
considerably more in the case of the SSD/PCIe solutions!), but still, I just can't get that excited about a 100 to 300 speed jump.
- Thirdly, cable distance.
Another thing to realise is that you have to use a TB3 cable to connect into the Qnap at their full speed offered. That means using an
active 40Gbps cable, which currently has a maximum length of a whopping 2m. I'm not sure if you could use two
Apple TB-to-TB3 adapters on the end of a
Corning TB1/2 10m optical cable, but likely you'd drop speed in doing so...perhaps maybe, who knows? (I should add, I've tested using two of those Apple adapters on the ends a 10m Corning optical T1/2 cable to get to an LG 5K TB3 display;
and it works! Which is at least encouraging, if nothing else).
This means the loud noise of the Qnap (like virtually all storage boxes), and/or the need to just store the device away from your Mac (a main reason for Ethernet storage connections), is likely only achievable via Ethernet. And to get 10GbE over
any distance (1m or 100m), that'd mean buying a
TB3-to-10GbE adapter from the likes of Promise (~£300)/Sonnet (~£700)/Akitio (£??) at even more expense (unless you're lucky enough to already have 10GbE on your new iMac Pro, of course! A handful of people, and not most of us 'average' consumers).
That's it really. If I'm missing anything in the analysis, then please someone chime in and tell me, as I'd love to know if I have genuinely missed something. :-|