I hardly use it my tank now, mainly because I just couldn't be bothered to put it in the tank everyday.
To answer daz, yes it's good for trad, gives a better slip.
It's also good when you add it into your backpack with chemicals for cons etc.
My perfect chemicals mix at the mo is 2 squirts of vision, one big squirt of fairy and a bit of heavy duty cleaner degreaser ( ubik, virasol or whatever).