Some have reported worse issues than others (dont ask me why - different system set up, different expectations how it flew?).
In my case the aircraft was taking way too long take off runs, the tail wouldnt come up fast enough on take off, it would dip a wing and spin into the ground at slow speeds without any warning (ie no stall warning), it had strange stall behaviour and it would ground loop very easily (although I understand this is a big issue with the real one so that may of been right).
I am keen to see what it's like when I get the update installed as in most other respects this is a very nice model.