Hmm, not sure I would say doesnt work well at low airspeeds.
I would say it works very well at low airspeeds, all in all is a fantastic wing, from a pilots point of view.
It is however poor from a point of view of the guys behind.
Perhaps someone with an excellent pof knowledge could explain.
As regards wakes, it really is a beast. To give you an example not so long ago we t/o 1 min behind a company 757 who was 5 tonnes lighter than us. Calm winds. At 1800ft we flew through their wake, and it was violent enough to disengage the autopilot.
If it did that to a 100 tonne aeroplane - what would it do to a light a/c ? I cringe when 737's or less say theyll accept a minute behind us !