We have been Cochran since 1994, first Nemesis, since 2000 Gemini Plus. After a threatened (not actual) malfunction, we bought a 3d unit as backup. We rotate them, and the three have about 1100 dives among them, the majority on nitrox. Extremely user friendly, replace your own batteries & c. Easy to read, with backlight for night and dark wrecks. Analyst software & interface are fun, and some esoteric settings are accessible only through interface. All the common ones (max depth alarm, pO2 for nitrox, tank volume, & c.) are done with just the dive computers, and are easy.
Service and advice are excellent. The present model is Gemini (no "Plus") which has a smart wrist unit that can function on its own, instead of depending on tank unit.
Good website, divecochran.com.