Hi. I used a Lewden all metal board the other day with RCBO`s and have to say I was very impressed. The board is a little taller than standard and the RCBO are quite small, tighten up with real positivity and assurance. All adds up to plenty of room to work with. Yes they are a little more expensive but much easier to work on and neater than cluttered twin RCD boards. I have started to go away from the old boards and prefer all RCBO.