Why should I buy the Hex system? I have the MG3. It works well.
Then you shouldn’t buy the MGHEX tracker. It is a great deal for anyone that already have a full hexaphonic setup (Guitar with a hexaphonic Pickup and a way to get the 6 audio streams from that pickup into your computer (GP-10, Sy-1000, Breakoutbox/cable, etc.)), and also would like the extra details that comes with the 6x monophonic tracking.
The standard MG3 is fantastic and you get almost everything with it, but extracting really big chords in real-time from just a single magnetic pickup output has its limits, of course. And also, there is a per-string retuning capability not possible with standard MG3 (yet?) until a strategy for identifying notes on particular strings is discovered/invented.
But if you are happy with MG3 as it is, just go with it. That is still the most versatile setup in terms of connectivity. Just connect a cable (or even wireless) and you are good to go. 
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