I think that's a pretty decent price. My roaming plan from china unicom offers v. cheap calls/texts, but the unlimited 3G service is pretty pricey at 86RMB/day.
Having said that, I prefer that, since I won't use roaming data every day, and I can continue to receive calls/texts on my china number.
But for a short trip, this is an excellent price -- and given the number of americans on CDMA who can't buy a SIM, makes even more sense.
tb