I would like to know, since I'm a beginner, is it a good idea to buy older mics off of Ebay and the like, or has mic technology dramatically improved over the years? Do older mics suffer from age....say like diaphram brittleness or something? I'm currently looking at a Sennheiser MKH815-T with converter, zep, and fishpole for much lighter money than new stuff today! I'm thinking I can gain an education at lesser costs this way [Ebay], then I can buy the new stuff later! It seems if this mic is bad, I still have an oversized zep and pole to salvage my expenditure. Is this crazy, to purchase such an older mic?