I am long time flow user and supporter... since 2000 i've been using them.
However, pretty much ever flow I've ever owned has some malfunction eventually. I had a 2007 M-11high back completely snap in half just from hard carving, I am assuming the cable put too much tension where it sits on the highback.
I'm currently using a 2007 nxt and a 2008 nxt at and although they are pretty beat up, they are holding up. But I am expecting them to malfunction soon.
I am like a battered wife, I keep going back to flows despite the abuse.