Even though it's only been a short while, I am gravely concerned over the implementation of Sneak Attack.
Forgetting 5th edition official rules for a moment, my major concern is how often Sneak attack fails to function - I have just tried to start a new Rogue after getting sick of this failure to fire and already, 1 combat in, I used a surprise attack (within range) to sneak, then hid and repeated it only to find the roll has advantage but neither attack had sneak damage applied.
On top of this, I do not understand why sneak damage is being applied individually, instead of as part of the attack. If I hit for 7 plus 3 sneak damage, applying them separately reduces the damage to 4 against a resistant imp while applying them together would mean 5. Losing 20% of your damage output because of design implementation is hardly fair now is it.
Please can you fix sneak attack so it works when it is supposed to, and not leave us to feel miserable over a class we want to play.