Stay away from the cheap ones. I was shopping around for a set and came across this thread from the BRZ forum:

http://www.ft86club.com/forums/showthread.php?t=42961

 

I've had good luck with the switchbacks from iJDM so far but they are in the smaller housing in the bumper which I don't think would be too noticeable if it hazed like that considering how the lenses are designed. The ones i'd be more concerned about are the DRL's, I know they aren't switchbacks but if the adhesive is the issue then I have to keep an eye on these too.

 

these have been happening to people with LED DRL and side blinkers.. its not just switchbacks.. so you get what you pay for guys.

dont cheap out.