Not a pellet grill owner, but here are my two cents. Apart from the software core of the pellet grill, the thing that worries me is the cleanup. I was surprised how cumbersome it looked on the Tom Horseman video of the searwood.
When I started grilling with just the spirit, I had a lot of the typical recipes where you glaze the food at the end. That was something I stopped doing because it left a big mess, and I felt it just was not worth the cleanup of the spirit grill.
But I get around most of it by using different recipes, and by smart use of drip pans. Most hassles can probably be minimized by a smart process. I wonder what the experience is for pellet grill owners.
IMO the biggest revelation to me has been getting a kettle. Now glazing makes more sense. Cleaning a round kettle is so simple. And if I want a super hot sear, I have charcoal. You could replace my old gasser+kettle with a fancy, super expensive gas grill in theory. Sure, they now come with an IR burner. But will it be as simple cleanup as a kettle? No.
I probably will never move back to a single grill. Even if the searwood does not have the perfect sear (neither does my spirit), then you can easily pair it with a small sear machine. Like the Q series for example.