I can only comment on the difference I have seen shooting both a standard 25-06 and my AI version.
With the standard version I trim about every third load. No much but if I don't the 4th load will chamber tight due to the necks stretching.
With my AI version, I trimmed the cases after fire forming, more or less to simply square the mouths as once formed they are shorter. Once squared however I have noted no more than .005" growth in any of the cases I have shot the most. In 11 or so loads they have held up just fine and other than simply squaring the mouth up, they have not shown any significant increase in lenght. I have used Winchester, Remington, and Lapua cases, all showing identical results.
With the standard version I am loading the 115gr Partition to 3150fps out a 24" stock Remington barrel. With the AI version I am loading the 120gr Hornady and Rem CL to 3350"ish fps out of the 28" Broughton 5C barrel. Accuracy of either is around 1" at 300yds if conditions are good.
One note on AI conversions. If you read about them in depth, you will find that some cases will show a marked improvement, some won't. This is not to say you shouldn't build one if you want one, there is always the cool factor.
However, when working up loads, you have to pay particular attention to the fact that the cases will hold the walls of the chamber tighter, than the tapered version which can and will give way to showing any of the usual pressure signs.
So IF you go with the AI version, you have to bear this in mind. All of the loads I worked with on my AI version kept the barrel length in mind when testing. I accepted the fact that I wasn't going to gain much over the parent case, except what I could get with a slower powder and the added barrel length. Going from a 24 to a 28" lenght I calculated 75 fps per inch, and while probably not totally accurate it was what I used as a top end for my loads. With the top end of 3000fps from my standard version using the same powder, and 120gr bullets, I worked up to the noted above velocity in the AI version. I actually did work up higher, just to see where I would find the primers starting to flatten out, and while the velocity WAS higher and accuracy was still good, I settled on the lower load simply because I know it will shoot well in any temp I encounter, and I should still be easily within sane pressures.
There is no sense in pushing things just for the extra added velocity. Besides you are already getting the added performance from cases, and possibly bullets, and saving the barrels throat a bit in the process.