Omni Wheels

[Lord Banshee]

any good? they are cheap in chrome if i decide to go that route. Any body know any pro/cons of these
Omni Mach-5 17x7 with 205/40/17 $ $999
http://www.wheelmax.com/Wheels/Chrome/mach-5-sm.gif

or
Omni N7 17x7 with 205/40/17 $ $1049
http://www.wheelmax.com/Wheels/Chrome/tz7-sm.gif

are these lighter than stock 15" Gt wheels?

thanks