The MXR M87 has long been a staple on professional boards because it brings genuine studio-grade FET compression into a compact footprint. Unlike many stompboxes that mask your instrument's character, the M87 is remarkably transparent. It doesn't add artificial 'warmth' or 'grit'; instead, it provides surgical precision over your dynamics without sucking out the low end.

The standout feature is undoubtedly the 10-LED gain reduction meter. For bassists, visual feedback is crucial for setting the threshold correctly, especially when switching between subtle fingerstyle and aggressive slap. The Constant Headroom Technology (CHT) ensures clean performance even with high-output active pickups, preventing the unpleasant internal clipping that plagues lesser units.

Ergonomically, the five-knob layout offers granular control over attack and release times typically reserved for rack gear. However, the controls are quite sensitive; a small nudge can significantly shift the response, which might be intimidating for beginners. While it excels at transparent leveling and peak limiting, players seeking a 'squishy' vintage effect or heavy tonal coloration might find it a bit clinical. In its price bracket, it remains a top-tier contender against boutique rivals. It is a rugged, reliable workhorse for any bassist needing their signal to sit perfectly in a mix while maintaining its natural voice.