I for one will never buy anything that is all in one, separates in a box is OK as you can then repair or replace just the dud one.
A bit like break one egg you can still make an omelette but if they were all in one you cant make it! If you get my drift!
The other bit is you need to up the power on one axis you just get the one with extra power and keep using the others.

My 2p
Peter