Used the 'Premium' checkin this morning - wasn't overly impressed. The lighting had a terrible hue and the staff member accepting the bags complained about having a sore back despite our bags only being 19kg/15kg/14kg. She grabbed one of them as it was moving to fast and then moaned about hurting herself. She didn't make one feel that one was a premium customer.
Best feature is still the lift to the express customs line but today that wasn't much shorter than the other line although to be fair most times I go through does seem to be much faster.