Cary slp-98p owners!

Hey everyone who’s owns a Cary slp-98p, I was just interested to hear what your thoughts and opinions are about the built in tube phono stage in the preamp? Also how would you compare it to other tube mm phono stages on the market? Like the ear 834p, modwright ph-9.0 and Manley chinook phono stages. Would it be worth the upgrade? I’m currently using a Music first step up transformer with my Cary slp-98p but I just wonder dose it get any better than the built in one??