Cuatro is a very good bird, it is based on the Nova, which is trouble free mechanics, and it is bigger and suatable for 90 size or gas engines.
all our guys are very happy, since the heli is not so expensive, stable, and very easy to maintain
it is fly with 80cm blades and 12cm+tail blades.
the performance is excellent, and till the end of the year. robbe will be out of stock ,since many people want this kit.
it comes with many upgrades, etc.
i can send you a manual in PDF

Hope it helps