I am currently using Maruman Proliner G1 irons. Just tried my friend's Maruman Verity irons (10 years old!) and it felt much better. Felt as if the weight was more equally distributed along the whole club and that I was better able to swing the club fast. I am not sure how you compare the difference between these 2 models of irons. All I can see is that mine (Proliner G1) has a deep cavity, while the Verity has an extra piece of iron to fill up part of the cavity area.

Anyone can share some information on this? Thanks!