I love the look of the pen but I wonder what the toll would be on the writer for prolonged writing especially for someone with a tight grip. That deep knurling would probably irritate my fingers after a while. Just typing out loud, might not matter at all.
I did carry one for a month last summer and other than being a little heavy in the shirt pocket writing with it for 5 to 10 minutes was not all that bad. IMO the black Knurl grip was less slippery than the others. Did not get knurl marks on the finger tips. The mechanism felt solid and as a 'take to work and try to beat it up pen' the Knurl pen passed the test. I used a parker gel refill which improved glide over paper.
Do you happen to have the item number for the parker gel refill that you used? Also kind of a general question about refills...Obviously the ink that comes from PSI in their kits is a cheaper type, where would I find what refills would be needed for any number of the PSI kits?