There are several factors that that have me giving the nod to the Grafo over the Infinity - there is a rather long thread on this forum where I detailed some of my exploration into the dilemma of the two - For whatever reason, the nozzle that came in the .15 Grafo set up works MUCH better than the .15 in the Infinity. I ordered 4 more nozzles hoping to find another like the one in the Grafo, but they did not work as well - Using the .15 set up on the Infinity has paint initiation being ambiguous, where the Grafo is very precise, and consistent. Switching to a .2 set up in the Infinity has it working better, but... It isn't a "feeling" kind of thing - there is a visual difference in the nozzle that works really well, and the rest - unfortunately I have not been able to find another one that works as well...
One other thing that bugs the crap out of me with the Infinity is that the trigger feel is rather mushy - and it gets worse the further back you pull it. I am sure it has to do with the auxiliary lever being captured on the trigger post, but it is a feeling I can not tune out of the brushes action, and it is a negative for me.
Since my first post here on the subject, I have purchased more parts for the Infinity, and am now at the point in testing where I can just say that it is a brush I just don't care for. I have enough experience working with brushes that I should be able to get this thing to work better for me than it does, so I find it easier to simply reach for something else to use.