Agatha and Remote Detonator: Explosive Damage Scaling

Hi all. Loving game so far (only Level 5) and wanted to plan my build a little bit.

Is anyone using Agatha or Remote Detonator. If so, can I ask two questions:

1. Are they any good? 2. Does damage scale off gun skill, explosive skill or both?

I assume they grant TempHP if you're using Bomb Suit Helmet so sounds like a fun build, but I don't want to max explosive skill if it turns out the guns are rubbish or don't scale off explosives.