I had a GBL for a while. It's hard not to like shooting MOA groups with 400 grain bullets out of a lever action. Problem-free gun. I also had a later 1895 Cowboy ... same result. I would try to avoid the ones made around the time of transition, both the last 2-3 years of Marlin manufacture and the first year or two with Remington. The current ones seem as good as the old ones ever were, maybe not quite the wood-metal fit, but the accuracy and reliability. I buy guns to shoot, not drool on ... drooling only happens if they shoot well.
There seem to be a lot of people automatically enthralled with the JM guns. I'm not one of them. Some were good but some were truly awful, too. There are NO guarantees.
Tom
