Great cameras, I have two and haven't been disappointed. I previously owned full frame Canon SLR's (EOS 1Ds mk 3 & 5D mk 3) with a variety of L lenses, and got thoroughly fed up of carting it all around. The X-T2 is smaller and lighter, the XF lenses are good quality.
A battery grip is worthwhile, three batteries can cope with a couple of days shooting.
I buy & sell with MPB, their collection service ha always worked well valuations have been fair. The only issue I had with one product was dealt with quickly.