Avid Cable Disc Brakes

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So I put the question to the readers!  
1.  What the Avid cable disc brakes like?
2.  What are your choices?
3.  On a tight budget which is the best brand for your money?
4.  Why are my Grimeca hydraulic disc brakes worth nothing but a pinch of shit?  (So much for buying a $3200AUS MTB when I can not use it because of the f*^ked brakes.  The bike is only 8 mths old.

Anyway please post reply....