Douglas has been around for a long time...and there's a reason for that. I wouldn't hesitate to put a Douglas XX Air-Gauged barrel on one of my rifles. Lots of people want the newest, best, most expensive...And there's nothing wrong with that. Buy what you want...It's your rifle. But a Douglas will be just fine as long as your smith does his part.
My smith recommends them. He's been using them for 50 years, and says they're the only manufacturer that will unconditionally warranty a barrel for the life of the original purchaser, without making a big stink about it. So, I wouldn't hesitate to use a Douglas barrel. Just my personal opinion.