I think most customers are willing to part with a little extra for a Fusebox RCBO board rather than a double the price Wylex RCBO board, even though it’s in their best interest.
As above, the SPD is a game changer, and the 32mm knockout is conveniently located on the side of the DB where the main switch is, instead of the middle, makes installing tails that little bit easier.
I installed a dual RCD board in a rental property where the landlord didn’t want to pay extra for the RCBO board and the existing cabling for the RCDs is super flexible, again making installation that little bit easier.
Loads of space for cables, and the front cover aligns quite nicely and easily, which some boards don’t.
Build quality seems decent, although the main carcass didn’t seem as solid as a Wylex. Only thing I can think of to grumble at.