Personally, I think the CX is a poor choice if "learning to fly" is what you want. They're simply too inherently stable. The most they'll teach you is orientation. The reflex skill you need to fly regular helicopters is totally different. If all you want is some quick cheap fun a CX is great, but I don't think it'll teach you the nescesary skills you need to pilot pod and boom helicopters.

Something like the corona makes a great starter heli as they're extremely durable since they're fixed pitch, and they're big (apporaching the size of a .30 size bird). It still won't fly aswell as a collective pitch helicopter will in the wind, but they make good beginner outdoor helis, and even better eventual scale conversions (seems alot of people like these helis for scale projects, probably because so many bodies are available for it). I rarely see anything bad posted about Coronas, so if you can snag a good deal on one, i'd say go for it. Otherwise they're a bit expensive brand new, especially if you consider you could get a nice CP heli for the same price roughly. If you'd just like to jump into collective pitch birds from the get go and don't want to spend $500+ then the blade CP seems to be a popular choice for newbies.

As it stands, you'd probably get bored of the CX after a short time. It can't fly outdoors except on the most dead of days, and it can't fly forward at anything apporaching moderately fast, or you'll demolish the helicopter head in flight. The CX is mostly restricted to hovering and slow circuits from what i've seen. Anything else and you'll need a proper pod and boom helicopter.