Do not recommend. I had and dropped it from lineup. This piece of crapware overheats badly even with external blower. Buy gaming laptop. Or wait for new version.
No dongle, please! Only as an option.
I prefer to keep server away from internet too, but it is not a big problem to share connection from phone for 1 minute. All your expenses - 1 usb wi-fi dongle.
USD56 is the price for new chineese converters (which can do up to 3G SDI)
All your signals will be sd, so you can find really cheap old used converters sdi to composite.