I owned Sony EX300 before I purchase this upgrade. I considered UE700, Monster Turbine and Sennheiser CX550 and tried all of them seriously. I dropped UE700 out of list first, it didn't offer enough bass for me. To be honest, I like the sound signature of Monster turbine the best, however it's over my budget. At last I chose CX550, which was the closest choice under $120.   Like CX95, CX550 need serious run in to get satisfactory performance. After 300 hours of run-in over 3 weeks, the bass got tighten up, with considerable bounce back in the...