They are helpful there and they are not helpful there, depends on how busy it is.  The place can be mobbed by rich teenagers and trendy asians, but if you have a warranty and need help, and you have an appointment then you are fine.  I have to admit having an macbook pro and an !phone, I am always drawn in.  

But the skinny crew with their cool black apple shirts can be quite helpful if you really need it.  It is hard to resist not going in.  The tech people really know their stuff.  I do wish another Apple store would open up in the West valley though.