Rock n Roll Lubes

I'm about to get a new bottle of winter chain lube. Was going to go with
Finish Line XC again, but have heard good things about Rock n Roll Extreme.

It works out about £1 more than finish line for equivalent volume, but I
will give it a go if there are advantages. Has anyone tried extreme? How
does it compare to Finish Line for UK winter conditions? I've heard its
meant to be less sticky and less attractive to muck.

On a related note, anyone tried Rock n Roll Cablemagic lube? Just hype?

Any comments appreciated!