I agree with Scott, you received some good and bad info. Talk with a Dive Professional for any questions around diving with different air mixtures. Take the training if it`s something you`re interested in, you`ll learn everything you need to know about diving on EAN. The PADI course was great, been diving on EAN for 6 years, was a bit hesitant a first but once I took the course and understood it all, it was easy.