I'll say they are a pain to repair...
That took a bump to the tip of the headstock and "pop". It looked like a bowsaw twanging in the air.
I have done six repairs like this. The others brought to me the wood was too far warped to get a good clean bond. I won't attempt it if I cannot effect a solid repair.
I had one snap off at Guitar Center WHILE I WAS PLAYING THE GUITAR. That was an Epi LP with set neck. Two friends brought me brand new Epi setneck SGs with action problems. Three guesses what the problem was and the first two don't count. The Slash Sig model I had also had a kink at the third fret and fortunately was fine after I cooked it straight.
I'm glad yours are fine.
I know there are many out there that do not have any problems. I've played quite a few that were kindof nice. No problems other than the dinky pots and stubborn hardware.
Maybe I shoudln't but I compare these with other guitars that do not have this joint.
I am NOT saying every guitar with a scarf joint is bad. I just don't like the method and I have good reason to dislike it. Most often I don't see the ones that are fine, I see the ones that are not.
It is a way of cutting corners to manage price point. The cheaper method. The point I am trying to make is cheaper comes with a price and it's not Guitar Center or the manufacturer that pays that hidden cost.