I went from a MES40 to a
Pit Boss Series 5 vertical smoker.
Upsides - space as it has larger racks and I think more of them, better smoke, smoke tubes are easier to light and stay lit easier as there is a HUGE amount of airflow compared to the MES40. You can actually get smoke rings with the Series 5, I never really got one with my old MES40.
Downsides - costlier to operate as it uses by my really rough calculation about $0.50-$1/hr vs a few cents of electricity, more complicated as pellets can be variable in the heat output - electric is truly set-it-and-forget-it, but pellet controllers help mitigate that a lot.
I'm installing a Savannah Smoker controller as the stock
Pit Boss controller is utter junk, but some folks have had luck with the stock controller. I'm also installing a
Smokin-it Bella smoke generator but I still have smoke tubes. I'm looking at having spent $400-$450 over the cost of the Series 5 so that I can have it exactly like I want it.
- $199 for controller including shipping
- $135 for Smokin-it smoke generator+shipping
- $80 for various parts including external box for the controller to mount it on the side, better latches, electrical outlet w/on-off switch
- Using up a good amount of pellets to get it all tested and dialed-in
If I didn't have the Series 5 already I wouldn't have spent that much on it - $700-800 would go a long way towards something like a Smoke Daddy vertical.
If you have a MES40 and you're looking at a Series 3, I would personally pass. The racks are much smaller and you wouldn't gain a whole lot. If I could find another Series 5 for $110 I'd get it just to have a spare.