How is Dunkirk as a boiler?

While it won't be the deciding factor, very few boilers qualify for the federal energy credit. Since it also isn't really all that much, I'm not sure how much of a deal it is to choose this brand for that credit. Does anyone have experience with any of the Dunkirk products? They've been around for awhile, but is is not, at least from what I've seen (limited) one of the biggies. It could be, but it has not come up before. They had an add in this month's Fine Homebuilding, so I thought I'd check them out...

Thoughts?