[Gustomaximus]

Both have a place. If a project is fixed in scope before the job starts, value based pricing seems to be the best to maximise profit. But what if a job is undefined? I sometimes offer a hybrid model where I do fixed pricing + and hourly spillover rate. This way things are upfront if you have a client asking endless changes or other non-agreed tasks. And it's really important to scope what is included so this is agreed upfront. If the clients whim changes its easy to point out this isn't in the scope and will go to agreed hourly rates without discussions about what is expected happening half way through a project.

[cpncrunch]

I find the the "extra" changes can usually be nailed down and put into a new quote.

Another advantage of fixed price quotes is that you don't need to worry about "do I charge for fixing bugs", or "do I charge for phone calls/emails/conference calls". All of that is included in the quote, making things simpler and fairer for everyone.