I have a small home studio and needed to add some foam acoustic treatments to the walls. Not knowing if the foam would really help, I looked for a mid-priced solution as the price range for a set of foam materials can be between $40-$500. I chose Foam By Mail based on their pricing. I ordered 14 pieces in different sizes and thicknesses and can state that the material made some difference to the acoustics of the room. HOWEVER, the materials emits a nasty odor and it has been weeks since installed. The possible VOCs ( Volatile Organic Compounds) from the foam gives me a headache. I contacted the company and their suggestion was to leave a window open. Great. It's in the teens and even if it wasn't, you can't use a music studio with open windows. My recommendation, if you purchase from them, plan on leaving the material in your garage for a month or two to air out. That might help.
Update
I wrote the company again about my issue with the foam odor and they provided a partial refund so that I could take steps to mitigate the odor. I must say their customer service has been excellent in terms of quick response and resolution of issues.