Listen to Luthier269 , it,s way more rider than bike at the b,c level. The cr125,s are built more durable than other bikes, you can put mega hrs. on them and they feel like a new bike yet, tough trans.clutch,etc. For hill climbing a 2011 won,t impress you much either, unless you mod the motor and then the fuel is 10 per gal. A 04 cr125 has the cases fixed,just deck and port, a cr 05-07 is just as fast as a 2010 YZ, and the CR doesn,t blow tranny,s and handles alot better. A pal of mine works at a KTM dealer, and told me the top am. and pro,s were surveyed on what is the best chasis ever built, the CR125 won handes down.