The CX2 or Lama are both fine to learn on, but don't expect too much out of them unless you want to pump in a lot of money and time in upgrades that you can't carry over to anything better later on. An upgraded blinged out coaxial can cost more than a better single rotor heli package and even upgraded, it's still a coax, which is fine if that's where you plan to put your flight time and bucks - I didn't and didn't know that info up front.
If I were starting over again I would have found someone that had a Lama or a CX2 in my area and flown it around for a few hours (minutes maybe) to get the hang of it and put the $179 I spend on the CX2 towards my Shark. I had no idea that I would pick up and fly the CX2 so quickly.. it was much easier than I expected it to be. The only real thrill I got with it was when I flew it outside in the wind and crashed it because it was so underpowered and was being carried away by the wind lol.
Like Georges said, I quickly tired of the CX2's limits and moved onto the HBK2. Looking back at all the money I've spent to date, I should have gone right to the Shark 450 because it would have been as easy to learn on as the BCX2, saved me a bunch of cash, had the performance and stability of a trex for much less than half the cost - complete.. not for a bird without most of the things needed to fly it heheh.
Before you drop the cash on anything, shop around, get a good flight sim, go to your local flying club and ask around to see if you can train on a coaxial bird or single rotor bird there with training gear when there is no wind.
Then later, go back to the club and fly the trex 450's and 600 so you can honestly compare it to some other trex clones on the market. You will find that the gap between them is getting smaller all the time and the money you save is yours!
And remember, everyone crashes and a $2,000 crashed/downed bird with an expensive super computer transmitter won't fly better than a $400 downed bird because four more $400 birds are still in the air!.
There will always be better high end birds for less and less money as time goes by. Learn with the cheaper ones and save. That's the best advice I can offer you, of course it's only my opinion, and you will find many.
Best of luck to you in whatever you decide to get, and happy flying!
Steve Evans