Audio Note Step up transformers

Any one have experienced w/ Audio Note Step up transformers ? how are they ?
I tried the AN-S2, but prefer the K&K that I built. And this was with an AN Soro SE Phono, AN AZ3 speakers, AN CD2, AN cables, and my home built Teres. I would like to try one of the higher AN SUT, but the cost has precluded me getting one.
AN step up are kinda pricey!! that the reason why am asking around how these are. Thank to those who replied
I have a S8, and I it is by far the finest I have heard. I have also heard a S4 that was quite good as well. They were different loadings for different carts., so I couldn't listen to them and make a judgment as to the differences.

I thought the price was crazy, but after hearing it I had to pull the trigger. It was THAT good.

Good Luck.