Well, not the normal way of an introduction post this (i\\\'ll do a proper one later!). However, I have to disagree with the post above statign that discs are overkill. I seem to remember that was what everyone said when they introduced V-brakes! I will admit that for old style xc (ie distance rather than techinal challenge) I would still rather have a set of Magura racelines as they just work better for that type of riding but for technical stuff and where you are using the brakes more, a set of discs will always be the better bet. They are more powerful, less succeptible to damage and significantly more controllable when you get a little speed up. At low speed there is less difference but when the weather gets bad then they are definitely a more noticeable improvement in performance. Also, the performance of tyres and suspension has improved massively in the last 10 or so years which means that the performance available through braking is also correspondingly greater. On my DH bike I have a set of 4 pot brakes that, if you were really hamfisted, could in all likelihood drop you over the bars at 40mph. For the harder rider like myself, that added performance is invaluable and if available, I would glady accept more powerful braking. My hardtail in contrast does not see the same levels of abuse and therefore I find a set of lightweight 2 piston brakes with 7\\\"+6\\\" rotors more than acceptible. For the extreme stuff I do on that bike those work perfectly. For the endurance riding I do on the scottish estate tracks a set of cantilevers would do the trick just as well. It\\\'s about choosing the most suitable setup for what you do but saying point blank that they are a marketing exercise and a waste of time is wrong.
Also, with regards to bleeding The Avid Juicy\\\'s, I would say that you just need to practice. I am sure that you didn\\\'t get a set of rim brakes set up the first time that you tried; I know I didn\\\'t! With the avids, you want to be very careful to ensure that no air is sucked back in when removing the syringes as even a few air bubbles can cause problems. Once you have the knack it really is easy.