Last year, obfsproxy was absolutely still effective in China. There are several comments here that "Tor doesn't work". Yes, vanilla Tor hasn't worked for years now. While it's true China has managed to block obfsproxy for short periods, the Tor developers are constantly release updates that circumvent the blocks.

Source: I've lived in China for 3 of the past 5 years, using Tor and VPNs everyday I was there.