The last 3 times I reserved a limo from Hellas (pickup from O'Hare), I've had to wait anywhere from 45 minutes to 1 hour before the limo arrives. I've been told by the CSR there was a 'miss communication' , 'the limo had mechanical problems', and 'they're stuck in traffic'. These reservation were made well in advance. \r
I will never again use their services, nor will I ever recommend them for private or corporate tranportation.
Cons: Always late picking up at O'Hare.