geetee1972 – the lateral movement is supposed to be addressed/improved on the 4 but we will see after it's been in use for a bit. I can imagine the lateral movement could be annoying and I'll be checking for that it's tight out the box.
You'll find there will still be a bit of play straight out of the box, but not as much as with a Joplin 3. I've been using mine for a couple of months now and this slight play hasn't got any worse. I'm surprised they still can't make one with no side to side play at all though – I had two i900s which had no play whatsoever (unfortunately that was their only good point as they were terrible in all other respects).