I like TUMI the most.
Though it is expensive compared to others, it is very easy to use and strong.
I love their duffle bag (I am not sure of spelling) very much and all my family has one. It is really comfortable to carry.
If your bag got damaged, TUMI shops usually fix it free.
The NY TUMI shop (around 5th Ave. and 49th) even sent messenger to me to deliver the fixed bag.