I have a Gen I but just put that tire on the rear. I used to run Metzelers (ME880's). Then tried Brigestone G850/851's (front and rear). I'm back on the Metzelers and don't think I'll be changing to anything else.
The neutral steering and the traction is very good. But to be clear, the new Ultra ME888 is on the rear only.
I'm running a 180/55-18 rear ME888 and the Metzeler Roadtec Interact Z8 on the front (120/70-18).
I would run both Z8's front/rear or both ME888's, but they don't make the same model in both the sizes for front and rear that I need.
So far I love these tires. The Brigestones when new took away my confidence. Something about that profile made the bike feel like I was losing the front end sometimes. I put about 10,000 miles on those tires but never felt really confident on them. Just my feeling and I'm sure some people love that quick steering input. To me though, I was always worried on them.
Now with the Metzelers and the more neutral rounded profile, I'm loving the turns again.
Maybe next time I'll try the rear 'Cruisetec' tire. It's geared toward the power cruiser market that wants more traction and corner stick than the ME888's. They weren't available when I purchased these new tires some time ago. Same basic tire, but just more stick at the expense of less longevity.
When I purchased these ME888 and Z8 tires, I wanted the longevity and good traction on the rear, and some extra 'stick' on the front;
https://www.metzeler.com/en-us/products/tires/cruisetec
https://www.metzeler.com/en-us/products/tires/roadtec-z8-interact