The Corona can be a hot 3D bird if properly modified- mine is getting there- The FP head has to be replaced with a CP head among other things, but it's doable.

The Corona in stock form has a bad pitching-up tendency in forward flight because of the positive pitch flybar setup. I would recommend getting an aftermarket flybar to solve this. Unless LMH has addressed it, the stock tail case is terribly flimsy and cracks upon assembly. You can easily repair it with CA. The tail rotor design is a bit sloppy which usually leads to a waggy tail, but it's doable. It's far too easy to make a carbon tail link directly from the tail servo to the pitch slider bellcrank to not do it.

The trick to flying a FP bird well is a good ESC-motor setup with a computer radio so you can set up a throttle curve for precise altitude control.

Give [link=http://www.askmanap.com/corona.html]http://www.askmanap.com/corona.html[/link] this a look... Askman has been flying a Corona camera bird for a while and would be a good reference for info. I'm sure he would be glad to answer any of your questions.