I believe merc came out with the bravo to replace trs because its alot cheaper from a manufacturing standpoint. TRS drives are very reliable when not overpowered. Keep the HP under 500, and they live a long time. They share no parts with the bravo, and as long as they are setup properly, imo, are stronger than a standard bravo. Some parts are no longer available, but most still are. And there are TONS of used TRS stuff around cheap.