Since the oil filter does not have a bypass, the only way you know it's time to change it is by recording and comparing the oil pressure readings (time to change when it's 4-5psi lower than when you first installed it). Regular spin-ons have a bypass built-in so they'd just allow dirty oil to keep flowing around the filter element, while a filter like the CM would just restrict oil flow(very bad). With a dual gauge like that, pre-filter and one post-filter readings would just need to be 4-5psi apart to indicate when the filter needs to be changed....so no need to record and keep track of the actual numbers; just need to pay attention to how far apart the needles are from each other. I'm just looking for a gauge that looks closer to the stock gauges(clean look).
If you're asking about the benefit of the Canton filter in general, it's a larger filter and filters smaller particles out than most off-the-shelf spin-ons. Also, the lack of a built-in bypass means that all oil is constantly filtered.