Crystal tail lamp/fog light/signal light

[machinehead]

Hi,Planning to upgrade my E36 with crystal light all round. What is your reservation about these Taiwanese product. Some say water will seep in and some say it won't fit properly with some gap here and there.Some of you who has already installed these products probably can give your opinion.Where is the best place to shop for these items and it there any brand to look for.I knew one with the name 'DEPO'