Alan,
I'm thinking about upgrading to the M22's please tell me I will notice an improvement in the sound. I love the M3's but I always wanted the M22's
I'm the opposite. I have the M22s, but wished I had the M3s. The M22s are certainly detailed, but I found them a bit thin sounding...probably due to lack of thumpy bass that I prefer. I added a small subwoofer, but it doesn't completely mesh. With that being said, I still find it's a fantastic speaker. I just think the M3s would have matched my musical preferences better.