So I resurrected an 015 lastnight. It runs well, but the chain was crummy. Most likely the original 1/4" chisel Stihl chain that came on it. I have fooled with 1/4" before, but never really spent any time getting it just right. Well, I was quite impressed when I got done lastnight with just how well it cuts. The owner will be pleased as well. Awful big chips coming from that tiny chain.
I was impressed with an 015 that I worked on. It had the1/4 pitch chain. That stuff cut quick for its size.