Looks like crap. Very cheap design and totally different than a 'proper' LSD.
Especially when you pay someone for the install, I'd always go for a real LSD.
If you're tight on money, get a Mfactory one. If not, get a Quaife/Wavetrack/OSGiken/Drexler depending on what use/characteristics are required.
Also take note that its for a 188L diff. The e85/86 has a 188K, so maybe no fit I think.
I also have SERIOUS doubt with either the seller or the manufacturer. They spec that the materials are made of tool steel heat threated and hardened to 38HRK, but thats really really soft. Wether thats true or a typo, both is not very trustworthy