Formerly the best AYCE sushi place in the city, Aji Sai has unfortunately given up on quality and instead embraced a speedy, but ultimately unsatisfying approach to AYCE. Sure, they manage to offer more tables and the wait times have shortened, but your rice will be warm, Maki will be half-formed, and you're unlikely to get a good deal of what you order.
Do yourself a favour and go elsewhere for your AYCE sushi fix.