I personally don't need or want a guide that wants to spend the day telling me how great a fisherman he is and what a lousy caster I am. The latter I am aware of and the former I could care less about. Believe me when I tell you I have paid good money for just that type of day. Something about type A, I think they call it. If you need complete and undivided attention, they know the ropes.
Guides usually have access to the best fishing spots.
Its their job. If you are fishing a area like the Holston river or Beaverdam Creek for the first time, it could be money well spent. Coming soon will be a list of guides in the area . That is if I can get their permission. I will also list fly shops.