We have ADSL2+ and a household of three teenagers who like gaming and social networking etc. The problem is, our connection drops off all the time and lags lots (which we acknowledge lagging will happen on a wireless modem with many users). We thought the problem was with the modem supplied by our RSP so bought a new one, but no change.
We live in a 1940s house and clearly the house wiring is not great as some of the phone jacks don't work with the modem - we can only use the connection by the front of the house nearest the ETP.
We don't want to invest in a splitter if it won't improve things - what do you think?