My MacBook Pro's Superdrive is acting weird. There are many discs that the drive cannot read, it'll spin up, slow down, spin up, then slow down.. then eventually spit the disc back out. I need my computer every day and can't really afford to be without it. I heard that Apple Stores can do some repairs in the store, do you think this can be done in store, replacing my Superdrive? If so, how long does this usually take. I would really like to hear from those who have had in-store repairs done, and what kinds of repairs they are capable of doing.