I have and own some of Bursons discrete op-amp replacement kits and they are fantastic sounding and build quality is top notch. I also found them vey good to deal with. my first order got lost in shipping and they sent me a second set with out question and they dealt with the shipping company for a refund. I would defiantly buy from them again. Sorry I have not heard anything else from them but wanted to pass on my good experience with the company.