Well, for a balanced view, i must admit that my C journey has been great for 2+ years.
Just the one dent in my thigh, a couple of dimples on my derriere and nothing else.
One serious IPIR. Numerous episodes of 'forgetting' to breathe but nothing more dramatic.
Manual, slow injection technique, rotate hips, belly and butt.
If only I could be sure it was actually working?!