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IMO, yes it is uncool to have multiple numbers on a fixed price bid.
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On the other hand, I have a few clients who have no problem with this. Basically, in those cases, I estimate from X to Y (they usually differ by about 20%) with a promise of a status report halfway through the X hours.
In other words, I think it depends on client. I usually ask the client point-blank, "how do you want to handle this? Here's what I have done before....."
The whole problem with the world is that fools and fanatics are always so certain of themselves, but wiser people so full of doubts. - Bertrand Russell