I have the K1 tablet. I'll admit I initially bought it for Doom Touch so I could play Project Brutality on the go, but it is a solid tablet overall and easily the most powerful for the price. It's become my classic games emulation machine. I have emulators for Snes, N64, DS, PS1, PSP and arcade with countless games on it. I take it to work with me to play games during my lunch break. Bizarrely enough despite my PC being far more powerful the emulators run better on my tablet.
It does have a micro USB slot, which is used for charging and plugging into your PC to transfer files around. It also has a mini HDMI to plug into a tv or monitor and an sd card slot (only 16gb internal storage so got a 128gb card myself). Great screen too. It's just above 1920x1080 (slightly odd screen size).
In terms of streaming I haven't used the stream from PC but I do use GeForce Now subscription thing. First three months are free and has a decent collection of games, though still only around 100 at the moment with a lot of filler. You do need a seriously fast internet to fully use it though. I have a 3mb download speed and 1080p streaming just about keeps up. 720p is fine though. In terms of streaming from PC it's a case of having something from Nvidia installed, and not all games are supported.
I'd also like to point out the controller is actually probably my favourite controller. Feels nice and chunky, responsive, and has a lot of extra neat features such as the mouse pad, volume controls, android buttons and headphone port. There's built in software to bind touch only games to the buttons that's quite intuitive, although most of the actually good mobile games and emulators support it any way.
Overall, if you want a tablet it is still amongst the best in its price range (although the price goes up when you take into account the controller, sd card and case). Make sure you do get the K1 though. Not only is it running Android 6 (6 allows you to use the sd card as the main storage which is incredibly helpful). the first run of shield tablets had overheating issues. I'd recommend a portable charger too. I have small and large anker chargers. Small one doesn't hold much charge but the large one I take away for weekends and it charges my phone and tablet with plenty of power to spare.