IMO, the reasons for using a SUT are as above, you need more gain because of a LOMC, you have a MM only phono stage, or if your phono stage uses inferior transformers/active gain stage for MC, and also if you want to match cart loading.
I use my Hashimotos mainly because the Modwright PH9.0 uses inexpensive Lundahls in the MC side. I feel I get better sound staging.
Is it 'better?' Not by a large margin, but I already had the HM-7s when I upgraded and just kept them in line.
I don't see any transformers in the nude pics of the 526; my guess would be the MC side has active gain. An active stage is not a bad thing, but me personally prefer the simplicity of the SUT instead of sending the signal through another amplification circuit. Just my preference. OTOH, a SUT is creating another connection, something others might try to avoid.
If it was me, I would try one, used, so I could get my money back.
I mean you never know until you try!
GL, and as always, YMMV