We flew in from Shanghai on the Friday evening and then arranged a car (through the hotel) to take us the next day.
The warriors are awesome, and well looked after / set up as well which enhances the experience. There is a lot to do with the museum / audio guides etc, but for us the warriors were the main draw and an incredible experience.
On the downside, it was busy when we were there (at a very quiet time) and I have heard that it can be really packed at peak times. Also, the potential guides can be a bit pushy, pouncing a soon as you leave your transport. We also visited one of the tombs on he way back to the airport, which was rather dull.
Those points aside, it's an incredible experience that you really should go for if you get the chance.
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