quality of brake discs...does it matter?

Hi,
I've had my first set of disk brakes for a few months now (Avid BB7's)
At first I had some cheap 160mm shimano disks and the stopping power was hardly any better than caliper brakes (I use them exclusively on the road). I was so disappointed with them that I got a pair of 180mm disks (again cheap-ish Shimano ones) and they are a hell of a lot better and stopping power is great. However no matter what i do I can't get them to stop squealing (yes, I've tried everything).
I was wondering what the advantages are of better quality disks? If I paid for better quality disks would I get better stopping power and quieter braking?
thx!
I've had my first set of disk brakes for a few months now (Avid BB7's)
At first I had some cheap 160mm shimano disks and the stopping power was hardly any better than caliper brakes (I use them exclusively on the road). I was so disappointed with them that I got a pair of 180mm disks (again cheap-ish Shimano ones) and they are a hell of a lot better and stopping power is great. However no matter what i do I can't get them to stop squealing (yes, I've tried everything).
I was wondering what the advantages are of better quality disks? If I paid for better quality disks would I get better stopping power and quieter braking?
thx!
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Good luck.
Al
Giant Trance X3 2011 (retired but not sold!)
There is no secret ingredient - Kung Fu Panda
London Calling on Facebook
Parktools
There is no secret ingredient - Kung Fu Panda
London Calling on Facebook
Parktools
Giant Trance X2
Genesis High Latitude 2x10
Planet X n2a
Genesis Core 20
I do not believe (nor has anyone been abled to explain why it does in a way that then stood up to interogation) that contamination makes a disc brake squeal, a squeal is something resonating at it's natural frequancy, sintered pads are worse than organic (organic having more hysterisys and act like a damper).
Squealing can be made worse by badly aligned calipers or pads not worn 'square'. Avid BB7's usually give excellent performance when adjusted correctly, as good as most Hydro's.
http://www.pinkbike.com/news/Tech-Tuesd ... -2011.html
My theory on brakes in general is that people fark around with them too much. Give them a rinse with a hose now and then, change pads as required, otherwise just leave them alone.
My current ones on my main bike are 5 years old, never needed anything other than new pads.
Couple of Shimano sets - replaced fluid after 5 or 6 years of hard use on one bike. Never touched the other.
Some 10+ yr old Hopes - one fluid change although not used much now.
Just leave them alone, they squeal sometimes - ride them, hose them, it goes away until it comes back and goes away again. Etc.
There is no secret ingredient - Kung Fu Panda
London Calling on Facebook
Parktools
Giant Trance X2
Genesis High Latitude 2x10
Planet X n2a
Genesis Core 20
Relevant stuff: and . . .
XM-057 rigid 29er
Giant Trance X2
Genesis High Latitude 2x10
Planet X n2a
Genesis Core 20
So it says contamination with no explanation how....like I said, doesn't stand up to interrogation.
And I did all it said, no difference with the Juicy's, and I once worked on a car where you could get the brakes to howl like you wouldn't believe, small mass added by the brake supplier (Brembo) to the pad and they were silent as church mouse.....it's all about resonances, because Avid aren't going to admit they will squeal by design are they?