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In my experience the process works well, but the yellowing does tend to return to some degree. Using a method where the part is fully immersed in liquid is safest; if the peroxide is allowed to dry the result will be blotchy. Treating colorful parts is a bit hit and miss as to how the dyes react, I'd limit myself to beige Amiga and Commodore stuff unless there is an opportunity to do a test piece first.
I haven't noticed any increase in brittleness with the parts I've done - as far as I can tell only the very surface is effected. However, many of these old parts are certainly brittle to begin with.
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