I agree about the "The masonry bits are quite poor" . I recently bought this Bosch 50 Piece X-Line set from my local Robert Dyas (£12.99) specifically for the small size masonry bits, which seemed, at the time, to be a good idea based only on the price of individual bits or a 5-piece set.
At the weekend I was making just 4 holes in a brick (clay) wall using the two smallest size masonry bits, both of which 'lost' their tip.
i.e. on withdrawing the bit from the hole the tip (the cutting part that's brazed onto the main shaft) was gone!
To be fair, I was using a quite slow speed cordless drill and therefore may have been applying more pressure than I would otherwise need to.
Mind you, I ended up finishing the job using a larger size masonry bit that I already had which came as part of a 5-piece Bosch set of bits.
I've used the knife (does what I expected!) but not the other drill and screw driver bits, which were always going to be 'spares' that duplicate what I already had.