While I have not compared the Crossover with the Crossover ll; I do have two Cossover lls in my system. One on my power conditioner and one on my amp.
I'm very happy with their performance. I thought I would try them and then see where I would go from there. They've worked so well that they are an end-game for me.
The Crossover ll uses the rhodium plated carbon fiber/stainless plug. I've found in my system those plugs are refined, neutral, with great tone/timbre and detail. If you go for the Crossover I would have Patrick put the rhodium/carbon fiber plugs on it.
Cullen make fantastic cables. I moved to all Cullen Cables in my system about a year ago and have been completely satisfied.
Give ve them a try. I think you'll be very pleased.