Brian, I'm thinking about upgrading tweeters in my RM40's to the new vertical ribbon, and was wondering if you had heard the 40's with the new tweeter, and could comment on the sound, specifically if it gives a little better horizontal dispersion (ie, the lower crossover point allows the mid panels to never approach beaming).
Also, has anyone actually done the upgrade? I understand there needs to be a new cutout, but how involved is this?