I've had no problems with Qtel in the 2 and a half years I've been a customer, so unless Vodafone is significantly cheaper I'll have no reason to change.

Plus Qtel are already rolling out the special offers (10% extra when you buy QR100 Hala) so I'm already benefiting.

Vodafone wont be available til July/August anyway, so you've got a while to wait.