I have used Max and PC brand pinners. The manufacturers of high-end micro pinners want us to think we must have a 2" fastener length. I have found that longer 23 gauge pins tend to deflect in hardwood. This is especially true in rift sawn wood, or with changing grain direction. The pin will want to follow the grain, and will pop out the side, or generally not go where you want it to.
I say 1-3/8" is plenty for pin nailers. If you need a longer fastener, use an 18 gauge nailer.
My Max nailer broke where it won't set the pins very well anymore. The PC is newer, but still going strong.