So my Gen 1 Pro's are a little over 3 years old. Suddenly the right pod sounded busted. Did a search and found it was somewhat common. So I ordered a replacement pod from ebay which was refurbished and came in beautiful condition. Got it going and now I hear the left pod has a similar crackle that caused me to replace the right pod. UGH. Disappointed they both suddenly went to crap after treating them well and using them sporadically over the 3 year period. I'll get some Series 2 and take the loss on the replacement pod I purchased.