I have a 1994 2120. The 2120 is basically a 2100 series frame with a triple component group. The frame has carbon main tubes, aluminium stays and fork. A very smooth ride that compares favorably to mosts bikes in its class today. Not as stiff as current generation OCLV but I am a heavy rider and have had no problems with BB flex. The components are basically 105 level. Mine came with a mixed group and bar-end shifters (STI hadn't made its way to 105 that year) but later models seem to have STI brifters and full 105.
I like mine very much and recently decided to upgrade it to Campy Ergo rather rather than go to a new bike. If I was a racer, I probably would have chosen differently, but in the "sport touring" category the 2120 is still a valid choice.