My experience has been that there are typically two levels of quality. The lowest quality is press moulded, these are of generally very poor fit, and the plastic is very low quality. The second is injection moulded and are typically a better reproduction of the original, and the plastic is generally better.

Paint quality is fairly random on either process.

I use a local reseller, who has an intermediate quality step (also adds a little to the cost), so end results are generally better.

They are what they are, and for MC18 owners they are fast becoming the only other option apart from race glass.