There is one feature in Blender Octane integration that bothers me a lot.
Octane switching nodes in materials seemingly random. It happens when you have two shading networks and one of the networks contains Cycles nodes. The switching can happen when you assing, re-assing materials, swtich engines or duplicate materials.
I'm fully expecting Octane to start with it's own shading network when you create new material. But it's very disruptive when you already have Cycles materials and it removes your nodes with set parameters. If it's a popular feature for other users I'd like to have an option in Octane addon settings to disable this behavior entirely. I like having both Cycles and Octane shading networks together in one material.