Being a bit unsavvy a few years back, I bought XP Retail from PC World for £170.
Due to the expense, I cloned it twice.
I am glad I did. While I only made full reinstalls a handful of times, the disc stopped with errors after about the 3rd or 4th time I used it. (Cyclic Redundancy check Abort/Retry/Fail)
This handily allowed me to pop one of the other discs in and continue. Later installs sometimes had problems with the copies (different files) and would then require a disc change again.
However, sometimes no errors were displayed. I put it down to minor scratches and how clean the lens was.
I have recently used it again when messing with an old laptop and also on various Virtual machine try-outs on new laptop and desktop.
XP has always run correctly apart from getting it installed in the first place as above.