Pretty please, with sugar on top... I am even ok with it if the flipper tab is deleted. M4 is great, but LC200N also sounds fantastic.
I like everything about the Mantra, but the bearings are holding me back - too risky and costly for me to have a problem and then have to send it halfway around the world for warrantee work.
Honestly, the warranty on the pivot shouldn't be a make-or-break problem. The biggest issue with bearings is that they get gummed up faster than washers, which is an end user issue, not a warranty one.