I have the Arcadia VF-1S, and it's amazing. As others have said, super solid. I just wish I had Super/Strike parts for it.
Just yesterday I received a VF-17s and a VF-19s from HKCollectibles (who has them on sale at a great price), and both of those are incredible.
I only have one Frontier figure - the YF-29S - and it, too, is mind-blowingly good.