I have never owned a westie, but I've groomed and boarding hundreds of them over the years. I've never met a mean one, never been bitten by one. In general, I'd say they are easy-going, happy, friendly little dogs. Of course, as a terrier, they have a stubborn streak, but not so much as some of the terriers. I like their personality.
They are, however, prone to allergies. Sometimes it can be very severe - I actually had two of my customers who had to euthanize their westies due to horrible allergies that could not be controlled.
"We give dogs the time we can spare, the space we can spare and the love we can spare. And in return, dogs give us their all. It's the best deal man has ever made" - M. Facklam
"We are raised to honor all the wrong explorers and discoverers - thieves planting flags, murderers carrying crosses. Let us at last praise the colonizers of dreams."- P.S. Beagle
"All that is gold does not glitter, Not all those who wander are lost; The old that is strong does not wither, Deep roots are not reached by the frost. From the ashes a fire shall be woken, A light from the shadows shall spring; Renewed shall be blade that was broken, The crownless again shall be king." - J.R.R. Tolkien