I'm working with the USDA involving the benefits of mycorrhizal infections in Vaccinium (cranberry, blueberry etc) and we tested a decent number of commercially inoculum and found that many of the fungi present weren't what they claimed on the package. Whether due to their method of packaging, quality control or some other reason, there were all kinds of different fungi in the mixes. If you have the change to plate some out you might be surprised. I personally am pretty skeptical unless I've isolated it myself and even then my skills and the mycorrhizae business in general are still so muddy I don't think I'd subject my plants to something like that.
Now wouldn't it be great if we had someone go out and isolate mycorrhizae from the roots of some CPs and get a specialized mix just for us... I can keep dreaming haha.
It has been my experience that this is likely true with Trichoderma products as well... I tried many products from many vendors before I found the product/vendor combination that gave me consistant results and excellent customer support.