Dan, I shoot with Agfas, which offered cameras that competed mostly within the Nettar/Ikonta class, but they did have one offering which clearly ranks in the Super Ikonta class, which is called the Super Isolette.
To add to Pherdinand's statement, you will have to slow down to use a classic medium format folder, but a built-in or auxilliary range finder does improve image quality. On my plebian Agfa Records - which are 6x9 shooters -, I even bring along a monopod just to buy a little insurance when shooting at 1/50th of a second. The point is you won't be shooting from the hip as one does with 35mm. At 1/25th of a second on a camera with a 105mm lens, I'm beginning to wish for a tripod.
The Super Ikonta class has all the bells and whistles. The best two being automated film winding versus having to use a red window to stop the film at the next frame and a coupled rangefinder. These two features speed up the shooting process considerably. You can even try your hand at action shots since you don't have to take your eye off the subject. Just remember to cock the shutter. Even my Super Speedex requires one to cock the shutter.
That said, the Ikonta class, which lacks the above features I mention can give similar results with an accessory range finder. Some do have built-in range finders, but they are uncoupled.
My Record III and Isolette III, which both have Solinars are two examples of cameras from the Ikonta class which have built-in uncoupled range finders. You use the range finder to determine the distance and then set the focus ring on the front of the lens appropriately. Setting the focus this way is not a big deal and the two Solinars, which are Tessar clones never fail to amaze me.
Finally, with regards to B&W I can compensate for the lack of a fast lens by pushing 400 Tri-X to either an EI of 800 or 1600 and do compensating development in XTOL. This buys just enough leeway to use the Record III indoors without a flash and the large 6x9 negs still make excellent prints up to 8x10 that blow away any I've made using Tri-X with 35mm.
I do have a lengthy web page on Agfa folders, you can see at (
Agfa/Ansco Medium Format Folders) for more info than you'll ever need.