There are situations were EAN 80 is the best tool for the job,,,,,as 'mix' divers again we have to fully understand the pro's-con's of many deco mixes as well as our choice of back gas for a given dive setting....these could be 'actual best-mix' for that profile or for those whom chose GUE's standard catch all blends. This topic is one that can and has been debated for ever. Understanding the gas you choice to use is very important as we all agree.....using good dive tools and a good heaping of common sense goes a long way in having fun on those tech dives.