Should I buy a knock off Lifeproof IPhone 5 case?

The authentic Lifeproof case cost about $90, and I really don't want to spend that much money on a phone case. There are Lifeproof cases forsale on eBay that cost like $30 but are "3rd party imitations" that "meet OEM standards"(i don't know if it's true).

So either I'm buying a Lamborghini case(authentic case is $30 too) or a knockoff Lifeproof case for $30. OR I could buy an authentic otterbox Defender case. Which ones should I buy? I really like the Lamborghini one though but the Lifeproof one is nice too.

My advice: never buy anything that is an imitation

I know the otterbox works great and is very protective. Since it's not the authentic Lifeproof, I wouldn't recommend getting it because nothing is guaranteed and you don't really know how it'll turn out. I've purchased two otterbox cases and I drop my iPhone all the time, it keeps it in perfect condition no matter how much I drop it.

I know this post was from a while ago but to help anyone that reads it now. I bought a knock off lifeproof not even knowing it was a knock off because it says lifeproof and comes in an identical box. The sound was horrible. People had a very hard time hearing me. Today I decided to buy an real lifeproof case and now I come in clear to everyone. Don't get a knock off it's not worth it.