I had a case of the stuff a while back. It ran ok in my M11, but this seems to be somewhat dependent on the individual gun. I still prefer a bullet with a RN profile.
You might try a few boxes before you buy a bunch of it.
I guess I've been lucky, the flat nose (American Eagle included) have ran fine with my M11. Several years ago, I did have to bend the feed lip a small amount, with a small crescent wrench. After that adjustment, Its ran most everything.
The last factory subsonic ammo I bought was a case of 147 gr. Speer Lawman. It still has a bit of a flat nose but it's smaller, and the bullet has a more rounded profile vs. the typical TC profile.
It ran well in the M11/9 and Uzi. Seems like price was pretty comparable to the other factory 147s.
I have shot both the Lawman and AE flat point 9mm subs in my M11 both from Sten mags and Suomi drum mags. Had good enough success that I continued to buy them. I found a company (Ammo Valley)that sells new manufacture rd nose subs for $0.185 a round and they come in plastic ammo can.