I am not familiar with commercial composts so will be no help there. But IMO there is no substitute for making your own compost, where you know exactly what ingredients are going in and the source of those ingredients. My primary question to a commercial supplier would involve that aspect. What went in to the compost and what was the source of those ingredients? Colorado is a fairly progressive state, and I would be surprised if there is not a good source for high quality compost, perhaps even some with an organic certification, if such a thing exists for compost. Although we use commercial soiless potting soils, that same issue concerns me there as well and I'll be making an adjustment in the next year or two, perhaps even making my own blends.
Eclectic gardening style, drawing from 45 years of interest and experience. Mostly plant in raised beds and containers primarily using intensive gardening techniques.