Sold House 1 a few years ago (before the market took off) on my own. Glad I did because the Realtors said I would never get my asking price but I did. Saved myself some $$$$$ and actually sold it to someone moving in from out of state. It was basically a starter home and the price was under $200k.
Used a Realtor for House 2 about 1 year ago because the house I was trying to sell was probably one of the higher priced houses in the area so I figured I needed a broker to branch out. Also, I didn't think a buyer would be so quick to dish over $300k-$400K to someone selling a house on their own . To make a long story short, it actually sold to a local person and I got screwed BIG TIME by the realtor and it was one of the bigger named realtors.
The markets (in my area) is cooiling off a bit. It all depends on the asking price of the house and how it compares to others in your neighborhood.