I too have had the opportunity to test out a pair and was most impressed. Not the same sharpness as say the Swaro EL's, but for the money - super quality and as far as I can tell - unmatched value. If I was buying a replacement for my Ace Avians (which are highly rated sub £500 binoculars) those Fronteir ED would be my number one choice. They are slightly clearer and sharper than the Ace Avians during the day which to those Ace Avian fans will speak volumes.