Ive used it for a while and have had real good results. Biggest thing is how many bags of regular lime you have to carry, transport and spread versus Solu-Cal. Not to mention the virtually dust free application.
Obviously, soil test first, but in some areas you can pretty much guess that soil is acidic and know lime hasn't been applied if the customer hasn't had a lawn service and hasn't done it themselves after questioning them.
Also, I do not think they are "lying" as in the other site member saying what they claim is false.
Here is their site below, check it out. If you have questions I'd call them directly rather then getting opinion on this site.