im looking to buy a new track frame, so i looked at the leader website and their frames look nice and are pretty reasonable, but i dont really know how good they are. i need some advice.

go to the FGSS sub-forum. they're talking about leader all the time.

If you want advice building a leader frame you are in the right place. If you want advice for a track frame to be ridden on the track, try the Track sub-forum. Otherwise, do a search of the FGSS section. As AidanJ said, they discuss track frames all day long.