I bought my first Ortofon back in 63 or 2 it was a SPU model with a built in SUT's in a single headshell that plugged into an Ortofon Arm. I think the combo was a little over$100.00. Then came another with the elliptical Stylus. In order to improve tracking the SUT's were removed from the head shell. Over the years I must have had 4 or 5 different external ortofon SUTss. Each sounded different with a different cartridge only sounding right with its cartridge. When I decided to give up on LP's the first time only keeping 20 or so Direct to disc , Command, Sheffield , Mobile Fidelity, I tried a V-15 V MR and a Stanton 981. I kept the stanton and bought 4 extra stylii. That was the middle 70's. I basically had 20 lps and maybe 500 tapes in my collection until CD's were introduced. . Then in 2008 a close friend introduced me to Dynavector HO cartridges, I had said I was tired of SUT's with all the issues they brought with noise, RF interference and hum. Today as I keep adding LP's I added a Mac MP 100 because I want to go back to LOMC cartridge soon. Probably an XX2. But no more SUT's for me. I lived with them and installed them and they were always a compromise and a pain to deal with back in the 70, 80, and 90's. I will admit those that were more costly, gave better performance than the less expensive models. It was quite evident during demos. An SUT with a +/- 2 db response can totally color the sound and compromise the performance of a cartridge. So if you want a SUT that will allow the total performance of a good MC cartridge to shine thru be prepared to spend the big bucks. We didn't have the options back in the 60's and early 70's.