I have used TiteGroup for .32 ACP, 7.65 French Long, 9mm Para, 9mm Steyr, .38 S&W, .38 Special, .40 S&W, .45 ACP, and even .30-06.
I have found that it works great in the .32 ACP and 7.65 French Long.
It works well with plated and jacketed bullets in 9mm and .40 S&W.
It's been hard for me to reach "typical" velocities with it in .45 ACP.
It is a sooty powder. In my experience, it does not get along with Hi-Tek coated bullets, usually causing leading for me (the only exception so far has been .32 ACP). Others have had great success with it.
I've also noted it can be loud and blasty. Not as bad as Power Pistol for sure, but in .38 Special for example, I had some test rounds loaded with IMR Green and some with TiteGroup. The TiteGroup loads were noticeably louder, even though the IMR Green loads were 70 fps faster. Same bullet, primer, OAL and everything. It is also louder than IMR Red in 7.65 French, though in this case the IMR Red load is 60 fps slower.
In .30-06, 3.5 grains will propel a .32 ACP bullet to 979 fps from my '03A3. Full little "gallery load".