>>3368666I've had my SQ-A for 13 years. Love it to bits. Never needed a CLA despite me beating the shit out of it. Film backs have needed lightseal replacing but that's it.
You can buy 6x4.5 backs for the SQ line...so you'd be able to shoot both 6x4.5 and 6x6 with one. The ETR line is kinda silly to buy into for that reason IMO as the cameras are nearly the same size.
ETR + 75mm + back + wlf size:
>92mm x 106mm x 157mmSQ-Ai + 80mm + back + wlf size:
>92mm x 109mm x 179mm 