I, too, had a Jaguar butterfly that was nice and smooth, although the handles seemed a little thick and heavy. The plastic inserts in the handles started to come unglued, so I got rid of it.
The Bear MGCs are nice and sharp out of the box but get very loose very quickly. Overal construction seems a little fragile.
I've handled one Frost Cutlery butterfly which had decent workmanship and smooth action, but the latch became quite loose and the handle alloy seemed pretty soft.
Overall, unless you can afford a custom, you might as well buy a half dozen of those six-dollar Taiwan "Rostfrei" specials from Smoky Mountain Knife Works, then throw 'em away when they break.
Oh, Benchmade, how could you do this to us? *sob*
Razor