Same, too many uncertain factors. Every patient diary I've read had at least a few things go wrong (though they're usually fixable, I don't mean botches). And even with the "gods of LL" like Paley and Donghoon I read some somewhat shady stuff. One guy said Donghoon yelled at him for asking too many questions about his X-rays, another had Paley's nurses give him the wrong medication or something, another one had to go Donghoon to fix a complication caused by lengthening with Paley.
Plus even with these guys where you have to pay a s**tload of money there seem to be a lot of things you have to do yourself. And finally, this forum is filled with people undergoing LL asking for advice on various stuff, showing their X-rays etc. Shouldn't the doctors take care of all that? Why would you need to do research here if you've already paid for LL and are undergoing it with a good doctor? And my biggest concern: assuming everything goes as well as it can, do you recover 100% from LL or does it "haunt you for the rest of your life"?