I want to buy a good ball head. I've narrowed it to Markins M20, Kirk BH-1 and really right stuff BH-55. The least and most expensive of the three are the Kirk BH-1 and BH-55 respectively. I am leaning toward the Markins M20 but I've read about the panning base not locking fully and about binding in the cold. I'd like to hear form Markins M20 users regarding this and regarding customer service.