Yes I did have your callipers Darren and I keep meaning to report on them.
They were a simple direct swap for the original 65mm Goldline callipers on my Y2000 M900Sie although I did need different brake lines. I also fitted new discs at the same time, as the old Arashi ones were too thin after about 30000 miles of all weather service, but still not warped like the original Brembos were at 20000 miles.
The original 16mm Goldline master and lever works fine.
After using nothing but EBC organic pads in everything for over 30 years I decided to try a set of EBC HH sintered, front and rear (10 pads!)
My 2020 bike came with HH pads and I liked them, hence the switch.
I've covered about 1500 miles with the new brakes now and I would say they are better than the 2020 bike with radials and ABS, but only 2 pads per caliper. (J-Juan, Mexican made Brembo.)
I like the new brakes a lot, they are the most powerful I think I have ever used on a bike and have a nice controllable feel despite the HH pads, but it has to be said that sintered pads have come on a bit since the '90's.
I had cause to use them hard and urgently a couple of times, a week or so ago and they no doubt avoided two opportunities for life changing injuries.
So I reckon it's a very worthwhile upgrade.
The callipers are a bit heavier than Goldlines and the pads are more expensive. I did manage to claw back the weight gain by swapping even more nuts and bolts for Titanium.
But if this is being planned for an 1100S, surely they are Radial callipers on those?
An' anover fing. I'm pretty sure that you might find the same callipers fitted to some Aprillias whether you're looking for radials or axials.