Echoing the comments on how important it is to find the right match between cartridge and SUT, I was fortunate enough to evaluate three different SUTs after upgrading to my current Koetsu Blue Lace. I auditioned the CS Port (which I thought would be a good match with my turntable), SA Labs, and Koetsu. Each produced a very different listening experience and in the end, I went with the Koetsu. I can't recall the exact sonic differences (it was a year ago), but the Koetsu stood out as providing the most balanced and revealing improvements, versus the others which seemed to overemphasize certain elements.
Bottom line: if you can "test drive" several different transformers, I suspect you will find the right one in the end.