I've put 130 miles on the tire so far. I'm not an expert and probably don't know anything since I've only been riding for two years now. But here it goes.
101 degrees and I'm running 28 PSI in the rear. I'm running a 3" stretch on a hardtailed XS650. (light weight bike)
My previous rear tire was the Shinko. I didn't like it much. It was really hard even at low pressure. I bought the Firestone because I saw it on a few bikes I really liked and thought it was be a nice tire to run.
When I got the tire here it measured almost 2" taller than my old tire. It was also really soft compared to the other tire. I liked the looks of it and the size.
I mounted the tire myself and I had to use lots of soapy water to get it on. It fit really tight. I had to pump it up to 60 psi to get it to seat on the bead. I did not have it balanced.
The first ~25 miles it rode well. But I was still getting used to my new bike. (I redid the hardtail taking 5" out of it, so it's basically totally different to me now) I road on regular blacktop road with some bumps here and there. Went over two cattle guards. It seemed fine.
Today I rode another ~110 miles. This time I rode through Virginia City with lots of curves. I felt very confident on the curves leaning the bike over pretty good. Once touching my foot peg. I was riding about 30-40mph (speed limit is 35). Not sure if it's the new hardtail or the rear tire but it felt really good. I did hit a few potholes and had a gut check. But all seemed good.
Going down 395 is when I started to feel the tire out of balance. So I'm going to put beads in it this week. But even though it was fine on the cement freeway. It was 101* outside today by the way.
Once I got onto i80 with the cement grooved road I felt what others have said. It was all over the road. I was telling myself it was all fine that it's normal while in the back of my mine I was thinking the wheels are coming off my bike, LOL. After getting off i80 I was fine again.
So for my first ride on the bike with this tire I think it was positive. I'm not an expert and I don't have enough experience with other tires. This tire seems pretty good to me and I like the way it looks on my bike.