I didn't do many gigs with it yet (too busy with university these days ) but I can say nothing but good words about it. I totally fell in love with it and I always have it with me now (for study purposes and everything). It is by far powerful enough to run DJ software, and with its unibody casing just as sturdy, if not better than a MBPro. It may look more fragile, but it certainly doesn't feel like that.
I did encounter a few hiccups at the latest gig, but that was at running a latency of 1ms in ITCH while not having it properly placed (it was standing on some cloth so it couldn't get rid of its heat properly), so you could say it could be prevented. I guess any (Mac) computer would get a bit overheated in that situation.
Biggest advantage over a 13" MBPro DJing-wise must be the higher resolution (1440x900). The screen is absolutely gorgeous and thanks to the higher resolution the DJ software doesn't get cramped on your screen. It all gets a bit smaller though, but it's all still easily readable.
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