I have never ridden on the Scorpion Trail II so I can't speak to those tires. I do have a set of the TrailRiders on my V2. I ride them at 35lbs cold both F&R. I ride solo , mainly back roads and rarely gently.
Currently they have about 4500 miles and look fine. I expect, like all my tires, they will last to that 6800 mark that Spike cited.
They warm up fast, by design. We got rained on pretty hard a couple of weeks back just as it got dark. Because there had been no rain for a while I turned the traction control to max but never flickered the TC light. I don't exclusively use Avon tires but have been using them back to '74 (Avon Venoms). They are always a viable choice and I find that they stay round right to the end. The TrailRiders were 3 years in development and at first I was sad to see the Distanza line ended. (bought one last pair for my SV650) But these are just fine and a bit better on the road insomuch that they are now 90/10 and they wrap around the edge a little further. I prefer the 90/10 over sport/trackday tires because around here the roads are never swept between heats. We have those mini, mini land slides which leave gravel between the car tracks for days and lot's of road-snakes.
Last, I have seen the occasional mention of melting. They won't melt. But after a vigorous session if you get down and closely sniff them (no photos please) you can smell the rubber. Gota love the smell of hot rubber.
Current Rides: '14 DL1000 ADV, '06 SV650N, '93 900CBRR, '74 Ducati 750GT ['02 BMW K1200rs SOLD Aug '17]