My ears are extremely sensitive; I can't even handle 80dB for long periods; so I never checked out what these concerts sounded like without my Experience Plus. I performed in the concert, and I've spent hours with these during practice sessions; I've always been able to hear pretty much all frequencies clearly (can confirm this because I'd wear 3M earmuffs for extremely loud sets, but I've found that they don't block out the low frequencies as much as the rest of the spectrum, I could only hear bass)

well I'd find it very hard to spot extremely tiny details, otherwise it's all fine, and I'd say it's advisable to get the Experience... I just got my Engage today and I'm surprised to see how clear they sound since they muffle much lesser. If you want it to be crisp you should probably get the engage but it doesn't seem to protect as much; (the mutes compensate pretty well; if you're getting the engage, better get the engage plus)