Ive been running Ace DS1015's in my 8th for 7-8 months without hicup.
The only slight quible, is that the horns are a loose fit over the splines - so with the amount of force they're under the splines slipped early - but with a fresh horn and a bag on it, or two, they've been superb.
So remember, fresh horn put a bag or two on it, stop spline slippage.
or just use the supplied Ace horn - which is ideal bagless.