I use a GE VRII Golden Treasure cart for mono records. Absolutely sublime and whisper quiet. I use only 1 channel (blue and white) and use the mono button on my preamp. It results in proper loading, proper phase. I get sick of people saying there is no vertical compliance; that’s a lie, misinformation. There is vertical compliance to keep the tip in the groove and handle record warps. Just higher compliance laterally. No vertical compliance means the stylus bounces in the groove from record warps.
Stereo carts play mono microgroove records just fine. Very noisy, but they play fine.