My brother has the exact 5amp kit, it is good. On the heavy side because of the 5amp battery, but unless you are drilling about shoulder height day in day out I wouldn't be worried about that. I would buy it at that price, suspect it is Milwaukee trying to get a foothold.
Why is this 4 amp Milwaukee drill/driver combo £50 more than this 5 amp drill/driver combo?
Offer is genuine, or is there something wrong with the 5 amp kit?