As for keeping the braces in place, these work well.
Did any of the Mobius owners had problems with the cables needing replacement?
Read the Mobius tend to be quite hot (no ventilation).
I have mobius braces. Before that was pod and before that was AsteriskThats only on the first version of the braces (which i had). They initially used a braided steel cable that would fray over time. It happened to me and they sent me the nylon cables that come on the new braces free of charge. Changing the cable was easy. Any new mobius braces you buy today will come with the nylon cables, so no worries there.