Didn't want a huge tow ball mounted bike rack and the Thule 3 seemed ideal. Sometimes I need to have 4 bikes and the 4th adapter suited. It doesn't make the bike rack much longer which is good. The 4th bike adapter is not quick to remove once in place, so I just leave attached. This is not an issue.
Handled 4 mountain bikes doing 85 on the motorway no problem. The tilt function is not impeded with the extra bike. It's ideal.