I was just wondering what people's opinions were on the various cheap
impact drills around?

Everyone has a different opinion on this.

Personally, I would recommend buying ultra cheap SDS and impact mains drills
and spending lots on a really decent battery drill (non-impact). I might
even consider having two battery drills, to prevent the need to keep
changing bits.

I rarely use the standard mains drill. When I do, it is because

(a) I have a huge job that would empty a battery, such as screwing down a
floor.
(b) I'm mixing up mortar/plaster/concrete
(c) I can't find my battery drill
(d) The battery drill isn't charged

I do ALL masonry work with the SDS, including drilling 7mm holes for brown
plugs (I don't use red or yellow). Throw away the chuck adaptor and only use
genuine SDS bits.

Some people have had real reliability issues with the cheap (i.e. NuTool)
SDS drills. Personally, I've found mine to be totally reliable, if unsuited
to large core drills.

Christian.