It will feel like a vinyl record that has a center hole that is slightly too big. In order to fix this issue; you can order a new slip disc from Technics or the vinyl slip disc online. Or you can just slip a piece of paper in there to accommodate for the big size.
The final issue comes from MP3 CD's that are less than 128 bit-rate. If the bit-rate of an MP3 CD is less than 128 then you may experience some slight digital distortion while scratching or during playback. This is more of a problem on DZ1200's with 2.1 firmware or lower. (The new firmware version of 2.3 clears up 90% of the digital distortion on these low bit-rate CD's).
Conclusion
The Technics SL-DZ1200 suites its name and reputation well, with rock-solid build and reliable, accurate performance. The fact that it feels and responds very similar to the industry standard SL1200 turntables and with a user-friendly feature-set, should be enough to make this a serious competitor in the CD DJ game. The only 2 faults that were a little hard for me to overlook was the fact that it took 8 seconds to load a CD (same as numark CDX by the way), and the fact that you could not scratch with pitch lock on. If you can get past these two problems (and burn your MP3's higher than 128-bit); then you will be in love with some great decks.