I'd say it depends on how many "low and slow" cooks you do. I have a Stoker, and have had it for about 3 years. I'm glad I have it, but if it broke and I had to buy a new one, I probably wouldn't. That's because I only use it on briskets (20+ hour cooks) and I don't do that but about twice a year. It's hard to justify that kind of cost.
I could hire Mickey to stay up all night with the brisket for a lot cheaper.
As with many great inventions, Mickey stumbled on his success with a Naked Ham by accident. He started out wanting to cook a ham naked, but after 10 shots of Tito Vodka and the screaming from the neighbors to put some clothes on, he got confused and cooked a Naked Ham instead. The rest is history.