Hi, I was just wondering why there was a big price difference and what was the difference between these 2 companies kits? I have the is350 and was wondering if those safety precautions are really a big deal because that's the only difference I see, even though the xenith company also ahs "shock/water proof", but the xenondepot have "epoxy seal?"

https://www.xenithxenons.com/SearchResults.asp?Cat=1
http://xenondepot.com/product.php?product_id=148