i have a couple
they come in different ways. for instance, cf element has a few layers of carbon over original pieces. like on these interior parts. tony does beautiful work and is always great with customer service
then there is stuff like this NRG engine cover i got which is just a single layer of carbon by itself. not molded over anything. extremely light, which wasnt really a concern for me. still comes out looking great
both were worth the price for the major aesthetic improvement.
there are variations, as u can get dry carbon, carbon kevlar, colored carbon. i have only heard of fitment/quality issues on PW JDM's engine covers. but that was a long time ago, and may have been remedied since then