shaykh keller does come UAE but his influence is very limited. In UAE taswuff is very very weak. The habaib have some influence as habib ali lives here but his influence is mostly limited to the ruling elite and the hadrami settlers. The only person/group which works on a massive scale and on a grassroots level is tabligh jamaat. This is the only place where I've seen people of every colour and denomination together for the sake of ALLAH. Nothing can come close to the effort of tabligh jamaat in this regard.