Hi Seayou,
A professional repair with the same canopy or leading edge material will be perfectly fine. In fact, it's likely to be stronger. It's more of an aesthetic issue.
The biggest issue with second hand wings that I can see is the amount of stretch in the canopy for some of the cheaper brands. Having said that, unless you are racing, a "blown out" wind wing's performance isn't going to be massively compromised for the level that many are riding at, especially for a beginner.
DM