I just went through the Felder FB510 or MM16 decision. I went with a FB510. The FB510 listed weight is 550 lbs, the MM16 is listed at 530 lbs. The FB510 has a 19.5 inch flywheel, the MM16 is 16 inch (i believe, correct me if wrong). The proper comparison is probably the FB510 vs the MM20, and the MM20 weighs 670 lbs and has 20 inch of resaw. That seems more apples to apples. But the MM20 is list price of $3,995 and the FB510 is list of $3,195, a meaningful difference.
My decision on the Felder was a mix of some larger specs vs the MM16 (flywheel, table, accessories) and some other qualitative issues that were not related to performance at all. The MM16 is a known commodity and gets superb ratings. I've used one just once and it was spectacular. I knew I was taking some risk with the FB510 as it's a new model that Felder is now making in-house, but I saw those risks as not great enough to not buy it. Time will tell.
I was in the market for a 12 inch jointer planer and a 16-20 inch bandsaw. I focused on Minimax, Felder, Hammer. I wanted to achieve multiple goals...get machines that would fit my needs, spend within a fixed budget, buy both from same vendor if possible (but not necessary), get good aftermarket support if needed.
I went with a package deal, a Hammer JP and the Felder FB510 Bandsaw.
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I just got the JP and BS wired and running a few days ago, so I can't give a detailed review yet.
I will try to post a review after meaningful use.