Have you had any stability issues at all since you've downgraded?
Some people reported problems and suggested people either upgrade to firmware 2.0 and downgrade from there, or Downgrade from 1.5 to 1.0 and then update back to 1.5.
The downgrading to 1.0 then back to 1.5 method requires some files from another psp that is already running firmware 1.0. If you need them I'm sure someone on the forums will be able to help you out.
If you haven't had any problems at all, it's really up to you if you wish to go through with a 'clean downgrade'.
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