Looking for a Reliable Diamond Tool Mfg — What Matters Most?

I’m evaluating options for a diamond tool mfg that can support both custom designs and production-grade tools for precision cutting, grinding, and drilling. In situations where off-the-shelf tools don’t quite match the application geometry or material requirements, the ability to customize bond type, grit size, and overall tool spec is hugely valuable.

For anyone who’s worked with custom diamond tools before: