Coldkennels
Barnack-toting Brit.
I would hard disagree with this. The Zorki 4 and 4K is the single most problematic camera of the whole FED/Zorki line - I've seen so many of them with jammed shutters. Something in the way the slow speed mechanism was introduced makes them a lot more unreliable than the other reasonably priced models with a slow speed train (the FEDs 3 through 5). I've heard the slow speed train in the Zorki 3 models are even more problematic, but those are usually much more expensive anyway.Honestly I would just completely steer clear of the FED 1 altogether. If you're set on a Soviet rangefinder, the FED 3 and Zorki 4 are far better cameras
If someone wants a Soviet rangefinder with a combined VF/RF, I always point them at the FED 2, Zorki 5, and Zorki 6. Those things are basically bulletproof.
If you want to do a bit better than the FED-1, there are several cameras that you can purchase an accessory for called an Auto-Up which clamps to the front of the normal taking lens (usually a 5cm/50mm) and covers the viewfinder and rangefinder windows with a prism to change the field of view for close-up photos.
These are a lot easier to use than a NOOKY-HEESUN on the Leica.
I forgot to mention these. The Auto Up can actually be used on a lot of LTM cameras - they're specific to the lens, not the body. I use mine on a Leica IIIg from time-to-time, but they fit anything of similar size (Canons, Leicas, Niccas, Leotaxes, FEDs and Zorkis). You do need a larger Auto Up for bigger bodies like the Canon 7, though.
Anyway, they're much faster/easier to mount than a NOOKY, I'll give you that. But they're nothing like as easy to use.
The NOOKY has a moving cropping frame in front of the Leica's viewfinder, reducing the view from above and the side as the NOOKY is focused, meaning the framing is pretty much bang-on at all distances. On the other hand, the Auto-Up relies on a combination of a little nub, guesswork, hopes and dreams:

Here's what that looks like through the IIIg's finder:

At least with a IIIg, you have a wider view and some framelines that kinda-sorta help you frame. On everything else, it's basically guesswork. As a result, the Auto-Up is very much a "close focus of last resort" option for me rather than a reliable tool.