I have the Sportac and can only give general comments on them as I haven't tried the others.
They are comfortable to wear, better than any of the cheap non-electronic ones I have.
I don't think they are grade 5, but they do seem to block more noise than my cheap grade 5's, possibly because they fit better. Depending on the situation I would consider using earplugs as well.
Clarity of voices, etc is great, nice and clear, even for me who struggles sometimes hearing what is said on the VHF. Volume is adjustable to way better than normal hearing - I could literally hear the cat walking across the lawn towards me!
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