PS Audio Multiwave-good or bad?

I know a simular thread was written some time ago when the multiwave option was very new, but now hopefully there are many more users. I own the P-300 & am very satisfied with it. I consider it to have made a huge sonic improvement to my system. I'm curious to know what kind of improvement I could expect from the multiwave option. Is it worth the $250.00. Please be specific on the sonic improvements. Thanks in advance...Sagger