We’ve got only BioBizz, Plagron and Canna Terra brands available here. Personally I’ve tested Plagron and BioBizz in practically every variant (pre-fertilized or not) and haven’t got any troubles regarding wrong pH or NPK. Everything was in order and according to what has been said on packaging.
But 60% of the time I’ve bought soil with Fungus gnats or thrips 
. Pests in commercial soils is very common problem here, when using it you need to check plants often from the start and take preventive measures. That just sucks. 
And btw. what about mixing your own soil? The classic BOG soil instructions