I hadn't realized yellow spot has made it over here yet, thought it was only green spot.
Green spot is good, I'd compare it to an $80 bottle of scotch. Good, developed flavor and nicely smooth. Is it worth $55...that's up to you. Certainly better than the multitude of bourbons starting up and being released at $50.
My experience is that green spot doesn't measure up to Redbreast. Not the depth of flavor, and a fairly strong astringent aftertaste. It disappointed me.
I have a bottle of Green Spot and saw three bottles of Yellow Spot on the shelf last weekend. I prefer Green Spot to Red Breast. It is sweeter and easier drinking for me. I would love to try Yellow Spot. It is reviewed very well. The price point ($100) will most likely keep me from owning.