I was very curious to see how the short single action brush would perform so I gave this one a good run. As you expect from Iwata it's a nice bit of kit with a nice finish. The packaging was very ordinary but keeps it safe for transport. This is quite a heavy brush at 179 grams but it's also solid, the needle is nothing like the normal delicate one's, you can use this sucker as a ice pick I think.
As for spraying, well it does the job well remembering it's 0.4 needle so best suited for base coating but I was able to get a fairly small line regardless. I did wonder how a .4 needle would go with Alclad and it was not happy with it at all where the HP.C plus is great. The needle screws in and out to adjust flow and is a very nice tight feel, the flow adjustment was fairly course and just a small amount of turn changed flow quite a bit so the you have to be careful. Trigger action was typical Iwata and quite smooth. While on the trigger here is small a down point with the brush, when replacing the needle, the trigger is free to turn in the body and if you don't notice you will put the tip of the ice pick into the solid side of the trigger and not through the hole in the trigger as intended.
This is a nice brush and it performs well but I can't get used to the way you have to hold it, sounds silly and would not worry most id say but for me its just not comfortable so I'm afraid it's not my favorite brush and it will have a new home shortly.