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how bout USB speeds?
With this particular belkin TB3 cable, some ppl complained that its not really as advertised and that it is actually usb2 speeds instead of usb3.
Is this something to be concerned about too?
I was thinking of getting cable:
Belkin F2CD084BT0.5MBK 100W Thunderbolt 3 USB-C to USB-C Cable (Black) [link]
Please have a look !
This is more appropriate in either the weekly Discussion Thread or in /r/Mac - this subreddit is for photos of your setup.
Do you just mean a longer TB3 cable, with standard "male" USB-C plugs on both ends - or do you mean a true extension cable, with a male USB-C on one end, and a female USB-C on the other? I've never seen a Thunderbolt extension cable, only longer "normal" cables. There's the Apple-standard TB3 cable - or Amazon has Belkin cables in a variety of lengths.
If your dock has a female socket, and just an included cord that you have to plug in at both ends (all CalDigit docks I've seen are this way,) just a longer cable would do fine. If your dock has a permanently-connected cable (my HP dock is this way,) you're pretty much out of luck.
Im not sure what you exactly mean by wall dongle but in terms of accessories that are good for the MacBook that I can personally recommend is satechi is good quality and work well. I like this dongle as it really provides all the things I might need https://satechi.net/collections/usb-type-c/products/type-c-multi-port-adapter-with-ethernet-v2
Portable batteries are a little harder at the usb c wall charger you get is 61watts and currently there are a few usb c batteries that charge at that rate or higher. Lesser ones that charge at a lower wattage may not look to charge your MacBook or very little, unless your MacBook is closed. That is when it may charge more effectively again depending on wattage. Brand wise anker products are great and mophie products are excellent (pay more for name and tech)
USB C cables are a bit more tricky. Apple cables from what I understand support power, data, display but do not support thunderbolt
These are some of the products and name brands I personally go with because of quality, warranty and customer support. You don't realize how important these are until you need them. Anyways, hope that helps and if you have any questions feel free to reach out.