I am about to send in my M6 TTL for a warranty repair of a light leak that Ive had in the base plate for a number of months now and I was considering having the finder flare- free finder upgrade installed while it was out. Two quick questions though: who to send it to (Leica NJ, or one of the other names mentioned, Sherry Krauter(sp?), or DAG or ??). And also for those of you that have had the upgrade, or done a side by side comparison, was difference noticeable? Was it worth it? Its been enough of a problem for me lately that if the improvement is noticeable that Id just as soon get it done now.