The IIci is a popular model from the Macintosh II line due to the small form factor and upgrade options. Unlike the IIcx, the IIci features on-board video so you don't have to use up one of the NuBus slots for video.
The case design is shared with the Macintosh Quadra 700 though altered to stand upright as a mini-tower computer.
The IIci has a special slot on the board for a cache card. No other Macintosh II model had this cache slot, though third-party cards such as the Applied Engineering QuickSilver offered cache via PDS. Similar to the board itself, the cache card will need to be re-capped due to the original ones failing from age.