Questions on my budget, spending time to show me the mattresses (and then making me feel guilty that they spent all of this time on me), etc. Offering me a "last minute" deal once they saw that I was leaving. It was dreadful.
In this regard, IKEA can be a good compromise on price, selection, and their employees' relaxed, non-pushy demeanour. You get to try the mattresses and no one (except other customers) will watch over you.
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Contradicting all of my points above, I do want to say that investing in a Tempur-Pedic was a life changing decision. I definitely spend a more "rewarding" time sleeping in it.
(((obviously, but just in case someone is wondering, I'm not astroturfing for IKEA or Tempur. Just a satisfied customer...)))