I'm going to get my work to buy me a new MBP 13". Budget isn't too much of an issue, so I'm going to get an SSD. How is the stock SSD that Apple offer? I'm sure it's less good than e.g. an Intel one, but I'm wondering how much of a difference it will make in day-to-day usage; if I want to get a third party SSD and upgrade it myself, I'll need to have a decent justification to give to my work.