Over the pandemic, I went down the Barnak rabbit hole, so my experience is recent. The first navigational issue was just to get one that worked correctly. Eventually, I did. The number of potential issues is staggering so getting a really nice working example is more difficult than expected. Same with the LTM lenses. The level of vaguery of description and flagrant omissions by amateurs and professionals alike was an eye-opener. Nice, unmolested, clean examples of these lenses are worth the effort and extra money but difficult. Once you have a good body and clean lens the rewards are multiplied. My favorite is the magnified rangefinder but only in daylight. I still find it difficult to use the RF/VF in dim light...fine. My other favorite is the nooky and sooky adaptors....just nice.