The 1225 fps spec was for a 5" 1911. Since my M&P 45 Mid-Size has a 4" barrel, I'd expect up to 100 fps slower out of it.
I have chrono'd my CorBon .45 ACP ammo out of one of my 1911 pistols, and it averaged about 1140 fps, which is pretty close to what they advertise. The recoil is significant, but manageable if you're an experienced handgunner (I've been shooting handguns since 1955).
I haven't chrono'd any Double Tap .45 ACP ammo. However, a buddy of mine had some Double Tap 150 gr .40 S&W stuff that he was testing out of his Ruger KP94. I tried a few rounds of it in my Glock 23. Double tap lists the specs for that as 1281 fps out of a 3.5" barrel, 1317 fps out of a 4.5" barrel, and 1257 out of a Glock 23. In my Glock 23, it chrono'd at an average of 1235, which was close enough for me.
I have also chrono'd some of Double Tap's 10mm Auto that uses a 165 gr. Rem. Golden Saber bullet. That stuff is the hottest 10mm Auto ammo I have ever shot! Double Tap states that they get 1425 fps out of a Glock 20 with it -- for a healthy 744 ft-lbs. That's about what you expect from a healthy .41 Magnum. I only got 1350 fps out of it, but that was in my 4" barreled S&W 610 revolver, so I suspect their Glock 20 results are pretty close.
So, I don't have any actual chrono data on the Double Tap 185 gr. .45 ACP ammo. But, given my experience with chrono data of their .40 S&W and their 10 mm Auto stuff, I would guess that their .45 ACP ammo is pretty close to their stated specs.
In any event, the Double Tap .45 ACP ammo is certainly going to be hotter than regular 230 gr HB stuff, and I suspect that's it's at least equivalent to the CorBon ammo. It uses a quality 185 gr Nosler bullet, but I've never used Nosler bullets in a .45 ACP. I've used them in other caliber semi-autos, and they fed fine.
My point was that for ammo that is at least equivalent to CorBon ammo, it is about 40% of CorBon's price. I wouldn't carry it until I had shot some of it through my M&P 45, to insure that it fed, extracted, and ejected OK. I was hoping that someone here had some actual experience using it. If it works for me, I could afford to practice with the same stuff I carry -- which I can't do with the CorBon stuff because of their price. But, at $41 for a box of 50 rounds of the CorBon ammo ($395 for 500 rounds), I guess I can afford to do some considerable testing myself.