The 70mm thick foam works nicely in deadening highs and high mids - placed overhead and behind drum kit to deaden cymbals hats and maybe also the odd bit of snare top. Also created vocal sound booth which worked very well - very dead sound for a bargain foam slab ! Worth getting the 70mm over the 40mm a bit more expensive but more versatile (the thinner stuff probably only best on the ceiling) the price is still so much cheaper than pro alternatives. In my opinion they look quite nice too - they have a nice profile and another good attribute is that they are flame retardant.
I ordered a couple of these to help build a temporary production space, and they work like a charm especially considering the very low price. If you are a home studio producer, look nowhere else. Of course you could go with more expensive options, but the question is, do you need to? For me, these were a good option since I know I'll have to keep my solutions modular.
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