Miles has disabilities, yeah, but it becomes a plot point in later books that most of them are corrected. Even the bi-polarness settles down once he *spoilers*. There's another disability that pops up later, but that one gets controlled with, er, medication.
Not that this is a bad thing as far as the books go (in fact it make sense that the disabilities are corrected, given Vorkosigan's particular ambitions and the level of technology in his world), but I know that a lot of people side-eye books that focus mostly on 'curing' disabled people so that they can become normal. The Vorkosigan books, though not specifically about Miles' disabilities or the curing thereof, still fall under that pattern. Just something to keep in mind.
Random Vorkosigan quote:
"Schizoid or no, not even you could compartmentalize yourself to that extent."
"I am not schizoid," Miles bit off. "A little manic-depressive, maybe," he admitted in afterthought.
Galeni's lips twitched. "Know thyself."
"We try, sir."