I've run most of the brands in over 300,000+ miles on ST1100s.
Ran Excedras, but like the radials for handling.
Used to love Avons (Storms, etc.) until they started 'improving' them.
Metzler Z4s were the best, the Z6s not quite as good, but still one of my favorites.
Gave up on Dunflops after several sets of the D205s.
Run several sets of BT023s - great tire but not much mileage.
Tried Shinko front - dreadful.
Like the BT030GTs - been through a couple of sets.
Right now -
SweetTreat -BT020 BMW Bias rear, BT030GT radial front,
Redbird - BT020 BMW Bias rear, Dunlop Sportmax (a gift) radial front
Frost - Pirelli Angel GT radials front and rear - jury still out on mileage.
What I've found is every time a manufacturer 'improves' a tire, they tend to get less mileage.
So I guess their idea of improvement is more money in their pocket!