I will take a position somewhere between Dave and WWG.
1. Allen IS a brilliant machinist.....I know other machinist/knifemakers who are pretty up there in the stratosphere and they uniformly have much respect for Allen's skills. He is probably not the next Michael Walker...I'll elaborate below....
2. Disclaimer....I own three of his knives, and a Pirela collab. titanium pen....one knife is for sale because he is in the permanent collection...he is that good, when you find the piece you want...in my case, it is an e-lock, and a button lock, with integral machined bolsters, specifically this one, pic jacked from his website, hope it's OK, Allen?
3. Allen marches to his own beat...he is a shooter, martial artist, husband and knifemaker. Michael Walker has a mellow approachability, and a bit of mad genius that makes collectors swoon. Allen can be hard to approach, and a bit antisocial. He does pretty much what he wants to do. If you like it, great, if not...tough nuggies.
4. I just did a quick perusal, and there are 4 dealers with knives available from Allen. Don't know what his annual output was in the past...but it seems like he made a lot of knives. His designs are unique, and readily identifiable as his work....some have mass appeal, some are geared towards a different aesthetic. It really comes down to what you like.
The bottom line is that his knives are good value, and likely to appreciate over the years. They are very, very well made.
Best Regards,
STeven Garsson