Patrick is by far the best service. However, I would never buy a car from them. They are always more expensive than any other dealer though they typically have a great selection of used and CPO. If you are buying new, it should not make much difference.
Gone but not forgotten: 2008 BMW135i Vert
Gone but not forgotten: 2011 MB C63 AMG
Gone but not forgotten: 2011 BMW z4 3.5is
Added: 2015 Z4 3.5i