I give this pen a hearty +1. I have owned, sold, and given away a lot of 30$USD and below pens in the last decade. The 601 and Lamy Safari (and technically a brass Kaweco Sport if that counts) are the only pens in this budget I have kept. The 601 is my off the beaten path recommendation beside the usual suspects of beginner pens. The pen’s capacity in a very pleasant body is the big selling point for me. The filling system is neat, and the use of a O-ring type piston (is that the technical term?) like the one found in a piston filler over the latex used in the original 601 model is an excellent upgrade in my opinion. For people who throw around their pens, the plastic isn’t the toughest thing in the world, but I think your metal version solves that problem.
The hooded nib is great for slowing dry out too!
My question to you is how the balance on the metal version, especially when posted? The plastic grip worries me a little.