I don't understand how it would really impact a press move very much? I see how it'd make pull moves harder though. Did it hurt your usual rep counts?
Well, I thought that too and with my previous set up (doubled up lynx grips) i never noticed much of a difference. However, with fat gripz it's like holding onto a can of beer! It forces you to squeeze as much as possible, which is a great cue for pressing that not many people do. It may actually help in this regard. I think with pressing, you would notice it more when you went back to the normal bar. They deffinitly hurt your pulling a lot more but I think they would make everything harder - if not, then it certainly makes it 'different'.
Not sure about the rep count on pressing as we are doing a new exercise (for us, anyway). Just to see if it does anything, we are doing Close Grip-Fat-Bar-3-Board-Bench-Press. I couldn't use as much weight in comparison to lynx grips (20lbs less), however, we first done this exercise after pressing on deload week so, last week the main pressing exercise before it took more out of us (we're doing bench press before it).
With rowing - deffinitly. We done seated cable rows with a straight bar and pronated grip. Typically, I can do sets of 25-30, for 4-5 sets with the full stack plus a 7.5KG block you can add to the stack. With fat gripz, one set of 15 reps was my highest. I went for as many sets as I could (it was 'I go you go', staying above 10 reps, and got 7 sets.