I did the upgrade about a year ago. The .20 was already providing terrific sound but I wanted to try the .24. I paid the equivalent of about $900. here in Holland and the job was done by Meridian's Dutch distributor (My guess a Crystal chipset). What I got in return was slightly more air in the presentation and sizzle in cymbals but I also got a clean-bill-of-health on the inner workings of the unit. The unit is given a through testing. A little extra piece of mind. Jim
