It’s tough for me to compare to Cold Mac - Cold Mac feels like a wizard’s playground where you take your CVs to get twisted and with some study you can predict the outcomes. X-pan is a lot more straightforward, I reach for it with a purpose. Have used it much more as a mixer that happens to pan than as a panner. It seems like (and I could be wrong!) the design is biased panning towards the right, in that positive CVs (more common than negative CVs, yes?) will pan you to the right. Seems like maybe if they had added an attenuverter to the design, the panning would be more balanced. I haven’t gotten the hang of getting the desired effect of panning, so either I’m patching wrong or it feels flawed by design.
The other day used it to mix together a bandpass output from the QPAS filter with a lowpass output from the QPAS filter, it was great, felt like an all new filter! Also really helps with QMMG, which can overwhelm pretty easily.