In my opinion, the scale limited / team issue / 10 frame is one of the best carbon hardtails on the market. This high end frame has proven to be durable, and it is very lightweight -- you can easily do a sub-20 lb disc-equipped build with standard racing parts, or sub-17lb v-brake equipped with some exotic parts.

I don't know if the scale 20 has the same frame as the 10 and limited.