I have the 7XI, 9XI, 800si, 5. 7 and 9. The 7XI and 9Xi are easy to use, only drawback is having to use the function cards for advanced features like auto bracketing. The 9 is a solid camera, heavy, great features, but here in the low desert the viewfinder readout is hard to see in bright daylight. My goto body is the 800si with battery grip, not as many features as the 9, and menu driven, takes more time to set up. Viewfinder readout is much better, and it is lighter than the 9. Right now I have some of the Artista Pan 100 in the 9XI which I am shooting in manual mode. The 5 and 7 will work my few SSM lens, not sure why but I've not taken a shine to the 7. The A9000 is a one of a kind, the only Pro Level AF body with manual advance or choise of motor drive or auto winder. Fussy camera to use, but the Spot and highlight spot meter exposure modes work really well.