Had the 3000 lithium before it was wifi, asked GZ about it when it came out and they did an exchange for the newer model which actually came with the MPPT which my old one did not. No issues other than lugging the thing around, the newer Pelican Case I use is much easier than the older Hardigg case I previously used. Other than still needing the fridge and the 12v GZ adapter for fridges they say you should use, no issues. Haven't had to use my Boulder 100 briefcase panel yet to even try to charge it...
FYI - the Wifi, while a PITA to setup initially for me... has been great, keeping the unit elsewhere and using my phone to turn on banks of power at a time, for example the lights in my tent or whatnot, have been pretty nice. Initially when it came out, wifi only allowed you to connect to your own wifi at home, now you can connect directly with the GZ to interact.