Promise Technology Debuts $249 Thunderbolt 3 Dock With 5 USB-A Ports, 2 TB3 Ports and SD Card Slot

Another disappointing dock.

HDMI 2.0, no DisplayPort and inadequate power for MB Pro 15”. Pass.

Too bad there's no support for dual monitors. It needs a mini display port or another TB3 port.

65W? Why turn away half your target market ...

Exactly. All 15" MacBook Pro needs 85W charging. Anything lower is not adequate since Apple's charger is 87W. If you think you can do 60W with 15" MBP, you are either using it without any bus powered devices nor using any GPU / CPU power, in that case, 60W might work. If you use 60W and a lot of tasks in the background plus thunderbolt portable drives and GPU drivers, you will find your 15" MBP is discharging slowly instead of charging slowly and sooner or later you will need apple's charger to juice it up when it comes down to 5%.

Save yourself from the trouble by just paying a little bit more.
Belkin, CalDigit, Elgato are selling great docks for Pro-users. And such 85W dock is definitely a right choice for any 15" MBP users.

Belkin one is 350 dollars, not cheap, I know, but good quality. Caldigit one is 269 bucks directly on their site, and their Thunderbolt Station 3has more ports than Belkin and el gato's. all are better than promise's and owc's IMHO

This is quite honestly rubbish.... I can run my 15" MBP13,3 all day long with the OWC TB3 Dock connected along with running video, tons of cpu, memory and i/o intensive workload and the battery charge level stays at a solid 100%. The 60 watt power from the OWC TB3 dock is quite sufficient.

HDMI 2.0, no DisplayPort and inadequate power for MB Pro 15”. Pass.

Yeah, inadequate power. A desk-bound user (those docks will overwhelmingly be used on desks) really cannot live with a charging time that is maybe 65% longer .
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Has anybody actually tried running a 15" MBP on 60W? Does it "run down" while doing heavy work, or is it just that it won't charge the battery and run off mains at the same time (which would be tolerable for a desktop dock)?

Unless you are pegging all CPU cores constantly, an 60 W charger will still charge the 15" MBP just fine while using it, merely more slowly. Look at the range of battery life times people report, you find numbers from three hours (or even less) upwards. Meaning if running the MBP full throttle results in three hours of battery life (and the same usage while on the 87 W power adaptor maintains the battery charging level), than a usage corresponding to a six hour battery life only requires half as much power, ie, 43.5 W. Therefore a 60 W power supply will still have power left to charge the battery, just more slowly.

And I am sure those numbers are still conservative from my point of view. Pegging all CPU cores (+GPU, full screen brightness) probably results in a battery life even lower, maybe only two hours. Meaning usage resulting in six hours of battery life would only need 29 W. Thus instead of having 58 W of 'charging power' (87 - 29 W), you'd have 31 W (60 - 29 W) of charging power. My guess would then be that using a 60 W power supply (instead of an 87 W power supply), charging during usage might on average take twice as long. And charging while the machine is sleeping might only take 50% longer.
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Exactly. All 15" MacBook Pro needs 85W charging. Anything lower is not adequate since Apple's charger is 87W. If you think you can do 60W with 15" MBP, you are either using it without any bus powered devices nor using any GPU / CPU power, in that case, 60W might work. If you use 60W and a lot of tasks in the background plus thunderbolt portable drives and GPU drivers, you will find your 15" MBP is discharging slowly instead of charging slowly and sooner or later you will need apple's charger to juice it up when it comes down to 5%.

Nonsense, see above.

EDIT: Just found some numbers on battery life under very heavy load, of about 80 minutes ('https://www.pcworld.com/article/3157392/laptop-computers/tested-the-truth-behind-the-macbook-pros-terrible-battery-life.html'). Again that means, even if your usual battery life is only four hours, you are only using 80/240 * 87 W = 29 W to power the computer, leaving 31 W to charge its battery.