Daniel - Know that from the COC #1 to the COC #2 is a pretty big jump. You might consider the COC #1.5. They didn't have that when I bought mine several years ago.
I haven't trained them regularly in years. I got to where I could close the #1 easily, but could barely get the #2 to parallel.
When I was using them regularly, I just kept them at the office and would bang out 1-3 reps several times per day (GTG) and did pretty well. Things fizzled out with the #2 though.
I've been thinking about starting them up again though, with all of the recent buzz here.