im just guessing its the price that puts people off, the airtec gen 3 seems to be the most popular as it seems to give the same results as the pro alloy and is quite a bit cheaper. thats just what i think prob wrong
What swayed it for me was the group buy on the airtec last summer. Have been really impressed so far. I am sure the pro alloy one is a great piece of kit and if I had one fitted, I wouldn't be disappointed and no, I don't think you have missed anything!