Last year i bought a set of the the contimotion tyrs as they were on offer from Busters for £130 (worth a shot a shot at that price)
To be fair for most of the time they have been ok, not much feedback but reasonable grip levels.
However after 2k miles of mixed riding (not much motorway stuff) the rear is knackered.
The reason for the warning, the rear went from legal, and above the wear indicators, to showing the metal cords in the centre of the tyre, in about 300 miles!
The design of the tyre is such that there is no tread in the centre of the tyre, and wear is diffcult to judge, until its (almost ) too late!