I have a KO Rapid M and it's a great winter camera, really easy to operate with gloves on.
Regarding the frame spacing issue, I have three backs and they only have frame spacing issues with Fuji films, never with Ilford or Foma/AristaEDU films. I also have a Kiev 6C and again, I only have frame spacing issues with Fuji films, never with other manufacturers. Don't know if anyone else has noticed this, but it's been my experience.
The Koni-Omegaflex is a true reflex. It's a twin lens reflex, not a sngle lens reflex.
It is a twin lens, but not a true reflex, it is direct view. For some reason I am unable to paste but check out the manual, although there is a angle view with a mirror the standard view finder is a ground glass like a view camera. I had an Omegaflex, liked the 6X7 negative size, but did not like the viewing system and sold it for a Mamiya C 33.
My favorite finder for the Omegaflex was the eye level. Sort of a chimney finder on its side. One gets used to the view being upside down as well as reversed left to right pretty quickly, or at least I did.
How much do you use the Omega? I was thinking of replacing my Bronica kit with the Omega. Just bought it and waiting for it to be shipped, although the back needs repair. I'm afraid I'm going to miss waist level finding. I use waist level and prism about 50/50 % each. And how do you find the speed of the lenses? I'm getting the 58 mm, 90 and 180. Think I will be using the 58 and 90 mostly. So Im a bit afraid of the 58 mm not being fast enough for handhelding because there is not alot of light here in Norway...