Hi, I got one last month with a 1.4TC and later got the 2xTC. I like it and the range it covers in a (relatively) light weight package.
All my shots are hand held while on birding walks with my wife. It shaved a pound off the 200-600mm I was carrying. As many have said, the IQ doesn’t suffer with the 1.4 TC at all, and with the 2x images are still very good. That said, IQ wise I’m not sure if matches my Nikon Z600mm PF w/Z8. Maybe Steve will do a test. However the carry weight is the same, and I much prefer the a1 body over the Z8.
I’m not familiar with Greentoe, does it come with Sony warranty?