Apad iRobot Sound Quality from Internal Jack - Your Opinion?

When I got the device and tested audio with my Senheisser HD228 headphones, I was pleasantly surprised by how good the sound quality is. I am not an audiophile, but from my Lenovo Thinkpad SL410's HD Realtek audio and my M-Audio Transit USB audio adapter, I'd say that the Apad sound quality is noticeably better than my Thinkpad's integrated sound even with WASPI enabled. That's to say that it is very good. I tend to play music without the equalizer effects. Anyone else think the same?