This thread has been very useful and helpful to me in making the decision about adapters, etc...... My new rMB (2016) m7 with 512 GB SSD is on her way, and hopefully I'll be able to pick her up at the Apple store in two or three days. I've decided to start with the Apple Multipart adapter in order to be able to transfer some files and folders into the new machine from my other ones, which I'll of course need to do pretty soon after I've gotten the machine initially set up. I also figured that if anything went wrong with either the adapter or the machine it would be easier to take them to the Genius bar at the Apple store, especially if there is something faulty about the adapter.
This will be a secondary machine, so it is not as critical that I have several USB ports and the like, but I do need to be able to at least plug in an external SSD (Samsung T1 or T3) in order to transfer over the stuff and then later use it as a supplementary drive, keeping a lot of things on it rather than on the rMB itself. I do prefer to have a machine plugged into the charger at the time I'm doing things like transferring files and folders to an external drive -- hence the multiport adapter rather than just the USB-C - to USB- A cable. Since the Samsung T-3 has a USB-C connection on one end I will also experiment with that, too, later on when just looking at files on the SSD, using the Apple USB-C charging cable, no adapter. But then I won't be able to have the machine plugged into the charger at the same time. I am curious as to how this will all work out! I'm not planning to plug the rMB into either a monitor or my TV but we'll see; I may experiment with that further on down the road.
As for "port envy" -- nope! I've got the ports I need on my other computers and they will continue to do the "heavy lifting". About the only time I plug anything into the machine is when I need to transfer files or run a backup on the computer; I don't leave the external drives plugged in all the time, though. My peripherals are all BlueTooth, no need for a bunch of stuff hanging off the rMBP. I also do sometimes transfer stuff from one external drive to another and that works out fine with two USB ports or a Thunderbolt port and a USB port. That doesn't happen often, though and I won't need to do that with the rMB, which will be mainly a lightweight, small traveling machine.
