A great experience with onsen included. Clean, comfortable, and relatively, cheap.
I believe Dormy Inns are more in the upper 3-star tiers, compared to the big hotek chains in Japan. Major differences with some of a similar 3-star hotel chains would be: Dormy Inns provide onsen experience, although breakfast is not complementary. Of course, the breakfast which I paid for was far better than the complementary ones at the other '**-Inns'. I would rather pay for breakfast at a Dormy Inn and enjoy its onsen before bed and after waking up.
The price of my stay was relatively cheap, compared to other Dormy Inn branches in other cities. I would definitely choose to stay here again, however only if the prices are only one or two thousand yen more expensive than other 3-star chains. This would be because the room structure or cleanliness are more or less the same with cheaper 3-star chains.
The onsens are not huge, but its presence is nice enough, with complementary ice cream and soba at night, and a yakult drink in the morning.