A godsend. Makes getting the bus instead of cycling to work on rainy days bearable. Pretty nice coffee too; fresh beans and milk, and a decent sized portion.
The local rag did a story though on how (mostly independent) cafes in the area are suffering as a result. Apparently now Waitrose are the second highest seller of coffee in the UK, behind McDonalds.
I get mine from the Brighton branch. It has two machines, one of which is nearly always broken. The milk runs out often but someone always freaks out and shouts for a member of staff. Average queue length in the mornings is 3-5 people. I always go for the latte.