A lot depends on the condition and type of wall as an SDS Drill and tile removing chisel can do more harm than good.
I would only use mine on floors or walls that are rendered, not on old or modern soft plaster and definatly not on plasterboard. Most of the time I just use a 2 1/4" bolster.
Although you can pick up a cheap SDS plus machine for around £50 you will have to pay another £30 for a decent
tile removing bitso unless you are doing it on a regular basis best stick with the bolster.
Jason