Rubust design, decent sized connections for up to 3x 2.5s.
Crabtree haven't changed the design of this '4000' series of switches for over 20 years (since I was just a teenage apprentice) and there's a reason for that and that is simply because they got it right.
I always use Crabtree switches and sockets because they are so reliable. It's not worth getting the cheap brands.