The current NP race /slalom sails are a different design - see their website.
I have a number NP race sails of the same generation as under discussion here.
Rotation is not bad at all - just have to be patient and it happens. The price for rock steady performance. The Slalom equivalent is easier all round but not quite the top end stability.
One cam broke under warranty several seasons back but since then all good - seems to me that if they are going to fail it is going to be sooner than later.
Would I buy them again. Definitely.