Gawd, the mega cd!
I nagged my mum for 5 months till she spent 300 quid and got me one.
Then all the games were shite', but night trap was definitely interesting, even if it played bad.
Yeah Sonic CD was very good and you're right the music was excellent too.
The main reason to buy it was because it boasted a mode 7 bonus game (Think F-Zero-MarioKart technology) which the mega drive had been unable to do anywhere near as good as the snes, but now could thanks to the added power.