SD-COMP 87 is a "real" sidechain compressor featuring 2 inputs pairs. It can also be used as a classic 1 stereo input + 1 stereo output effect. In this case, its "reference" section will let you tweak the response of the compressor. SD-COMP 87 also features an integrated brickwall limiter (0dB) based on BW-LIMIT 87. You can be sure its output will not exceed 0dB with this limiter enabled.
Whether you want to get a subtle compression or some burning drums in your mix, SD-COMP 87 will suit your needs in most situations.