I've been a coco user for nearly 5 years and recently started about half my small tent, 5 plants, using straight (no added perlite) Great Lakes Water Only Soil, from Detroit Nutrient Co. Now at start of bloom, all plants are doing well (as well as on AN or MegaCrop as base nutes), other than 2 darker green (more N) than I'd like, but still no browning of tips and only 1 or a few leaf tips are downturned, so presumably not a problem. This soil is available in the U.S. from the nationwide HTG Supply stores, and other sources.
I went with this soil after seeing some positive comments on AFN. But what clinched going with this, rather than say a Roots soil, was that I searched and didn't find any substantive complaints or negative comments, which I presume is rare and indicates to me likely quality for any such critically-important grow product. If it didn't work well, that would be easily noticeable.