I have a model 2M (birseye maple) Flatiron flat-top. It developed some neck problems not too long after I bought it. It spent ten years or so in its case, pretty much unplayable, before I finally decided to take it in for a reset. It plays fine now.

If you do buy it and if it should need a reset in the future, make sure your luthier knows it has a bolt-on neck. The bolt-head is behind a label on the heel block. I only know this because my own luthier got totally stumped trying to loosen what he thought was a dovetail joint before he found the bolt.