I just replaced my Leader LD-735 track frameset (equipped with a carbon LD-1-806TR aero fork and FSA head set) that I bought around 5 years ago.

Rode OK on several velodromes but I needed a taller head tube so I bought a Ridley Oval frame.

This Leader has aluminum rear drop outs and is seeing nut wear (newer models have steel protectors).
I've seen quite a few of these bikes on Southern California velodromes but not surprising since Leader is headquartered in San Diego.

Personally I think there are better bikes such as those made by Fuji.

Update: I might add that the clearance between my Campagnolo, low Q, 650 crank and the chain stay was only two millimeters although there was never any contact.