I`ve got a wagtail , its an addition to my kit , but not a replacement for a squeegee , and i use it with out the mop , buy one and you will soon realise that the mop sticks to the velcro .
Ninja , neve used one ,, But i have a Sorbo ,, its good , but the rubbers are soft , and not that hard wearing ,, also expensive . i only use it now on windows with stained frames, as not to scratch them , those plasic clips have there use .
Get wagtail, if you can flip it , with out it sticking let me know , but in the meantime , get a normal ettore squeege .