There isn't a grow medium on the market I haven't heard somebody claim to get pests from. If I stopped buying every soil I heard somebody claim they got bugs from, I'd have very few choices.
I will admit that when I switched over to roots organic potting soil the number of fungus gnats I saw went up dramatically. But they were easily controlled by pre treating the soil with a little granular azomite. Once I started doing this I didn't see anymore gnats. But at the end of the day, if fungus gnats kick your ass, you probably shouldn't grow. =)
I'm personally going back to
Happy Frog because I find other soils too hot initially. I like the control
happy frog gives me and also it's the cheapest at only $14 per 2 cu ft bag at my grow store.
Also, my grow store keeps all the grow media INSIDE. That's important. I think a lot of hitchhikers make their way into the aeration holes on the bags while being stored outside at various retailers. I understand retailers doing this due to limited storage space in their stores. But I would never buy grow media that was stored outside. You're just asking for problems if you do imho.