Well i see many users in here telling that its stable...
But i still got all my clients on 6.2.x(lastest code of that branch)
I dont really need something in the 6.3.x just yet.
I was considering the 6.3.x in a client becasue of the centrilized licenses, and with that i wouldnt need to buy twice for a redundancy but thats it...
As a personal view i will wait for more patches on the 6.3 before moving my clients to it.
But thats my own personal strategy. You could get it and you might never encounter any issue, like other users that reported that is really stable!
Anyways just giving my 2 cents:)