Derek
Not sure,I use the envirodri for aggitation alot,I use the gold brushes which I like.My flexi-5 have white brushes,can be a bit harsh on some domestics.
Do like my sebo for vaccing,so versitile,carpets,stairs,upholstery.Did have some attachments for the flexi-5 for the vacuum,never got around to sorting them out.
Did try to see if the brushes were compatiable,but if I remember right I think the envirodri are slightly bigger