I was looking around on ebay for a new spoiler for my hatchback. I found one jdm type r spoiler and then a few type r style fiberglass spoilers.

My question is, has anyone purchased or heard if the fiberglass ones are any good? They are cheaper than the genuine jdm spoilers are, but I don't want to purchase something that is junk. Any help would be appreciated.
Here is an example of the fiber glass ones.