Two weeks ago I was offered two cameras. One a Rolleiflex MX and another was the Super Ikonta IV. I took both.
The Ikonta seems to function very well and it has it's second roll of film in it now. The LVS system is acceptable, to me, and the meter seems to be accurate. ( but I like to use a handheld meter anyway.) It is relatively lightweight and really easy to use. The lens is a f3.5, which a lot of them (all?) seem to be. The rangefinder is great.
I've managed a comparison:
I also have a Super Ikonta B (MX) with the coated Opton lens as well. I've had this camera for about a year now. It is somewhat heavier than the IV. The rangefinder on the B is dim compared to the IV but the lens is a f2.8. This thing is solid.
I bought a Certo 6 off the big auction site about two years ago. The best thing going for the camera is a far better lens than the front cell focussing Ikontas and has parralax correction. If you can live with issues like not being able to close the camera with the lens cocked this is a good camera.
I'm convinced that the Super Ikonta iii and iv are the camera of choice for all round good behavior. Lightweight, nice looking, great lens and focusing system, great ergonomics.
I will try for a Super Baldax next. I've only seen them on the net, never held one or seen one in real life.