Um, Losi already hase released the XXX4; its been out a number of years, and they just re-released the XX4.... Something nobody has mentioned on this thread yet is the very long, incredibly successful career the XX4 has behind it. You name a race, the XX4 has one it - IFMAR worlds, ROAR nats, EUROS, Japan's Golden week and other races, you name it, the XX4 has probably won it. And it's still proving itself to be very capable.
If you want great reviews of both cars, check out www.oople.com
. He's based in England, but does great indepth reviews of a few cars. He's also got pics/reviewed a sweet looking carbon chassis for the ZX-5.