This isn't what you asked but I figure it's going to be the answer to your ultimate question.
You're trying to decide whether to give mud-terrain tires a go or not, I assume. And you're running all-terrain rubber at the moment.
Disappointment is based on your expectations, whether you'll regret it or not depends on how you expected them to perform to start with. That's tricky if you've never had mud tires before because you don't have any frame of reference and really just pick some arbitrary benchmarks in your head.
This is one of those things you can't work out from reviews or commentary.
1/3 will tell you m/t are crap on-road.
1/3 will tell you they're manageable.
1/3 will tell you they're perfectly fine.
They're all telling you the truth as they see it. It depends where they've set the bar.
My 2c, if you're interested give them a go. Then you've got the experience and will know. Worse case to come out of it is you'll have a set of tires you don't love for a while, then you go back to your a/t's.