what is your ides of a good spotter ?

For me it is some one who is there to make sure if you fail there are there to help you get the bar up and safe, but should in now way help before even if you are struggle and strainnnig like mad. to me that the whole point i want to take it to the limet but with the safe net of nowing there are there if I fail

I hate it when I press the last rep out and I am struggleing to get it and all of a subdan  it gets easy as the spotter is doing the work for me

Amyway what do people think ?

someone who only helps when you ask them to and not before that really does piss me of