NOS Sniper universal wet kit...any good?

[cenok is family]

http://cgi.ebay.com/ebaymotors/NITR...007QQitemZ170189508489QQrdZ1QQsspagenameZWDVW

i'm thinking about getting some nitrous. how good are these kits? are they totally complete kits? whats the difficulty of install? thanks a lot