erm...
a couple of things I am worried about is suwari waza and shikkohou. From what I understand, that does put a lot of stress on your knees. I will consider which brace to purchase soon.
When I did Aikido I had trouble with suwari waza as well and a brace really doesn't help with this. I can't imagine whatever school you go to would have a problem with you sitting out on this if it is flaming your knee up though. Not everyone can do everything in the MA they choose which is ok.
Lance Boggs
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"The man who can most truly be accounted brave is he who best knows the meaning of what is sweet in life and what is terrible, and then goes out undeterred to meet what is to come."
Pericles