David Espinoza boots

I did a search first and didn’t come across much here, atleast as far as titles go. I see his boots pop up ever so often for sale and was curious about the quality of them? I know he hand makes the boots and that he has passed away. All I’ve ever seen is pictures of his boots never handled any. Would like to know quality and kind of “value” of them. I know worth will vary widely on what leathers were used would just like to avoid way over paying for them.