Last night was DQ. I've never had their non-ice cream menu. It was surprisingly NOT bad. I had a salad and small chicken wrap. I also had a raspberry truffle blizzard. Then I decided that was the flavor for me and I was ready to settle down.
DQ also has a decent BBQ sandwich, if you're into pork.
That's a giant piece of praise. I love the mushroom and swiss burgers. I'm not a big fan of Hardee's thick burgers (the texture reminds me too much of the veggie burgers of old), but I'm a sucker for a mushroom&swiss mix. I'll have to try one. 
I like Hardee's Mushroom & Swiss so much, I drive 30 miles round trip to the nearest store just to get one. If you try one, make sure you get the Curly Fries, also. They cost more, but are well worth it.
I too enjoy the Hardee's mushroom & swiss - for some reason all the Hardee's here do not have them on the menu. 
It would be the only thing I get there but have not been back in some time. Every so often they put a sign up saying that the mushroom & swiss "is back" but only for a few weeks.
I went to the aforementioned Hardee's once about 5 years ago and was told that they no longer had the M&S. The girl asked me if I'd like something else. I looked at the menu for about 20 seconds and told her "no thanks," then walked out the door.