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I got a pair of these to back up/replace a couple of ATM 11s I've been using for years to record choirs and orchestras on location. Unlike the ATM 11s, these can run on phantom power as well as batteries, so I expected them to sound similar but a bit better, with more headroom, etc. It may be me, but I don't think they sound as good, to be honest. They seem to produce a less 'open' sound, and do not particularly like loud percussive sounds. Build quality is fine, and I'd expect them to last as long as other AT stuff I've used. Do mics get better with age...........?