I have the Dinc4g, and have not rooted it just yet.
I have been trying to get FoxFi to work. My laptop will connect to FoxFi and receive an IP address via DHCP with no problem (using WPA password). I can successfully ping the phone while connected, but can *not* get out to the internet. I may be rooting sooner than later, as I too need to tether on occasion. In the mean time, I will be settling for a USB tether..
Edit: FoxFi does appear to work if you use the Proxy option (requires the FoxFi add-on). I was able to browse using FireFox after setting up the FireFox network settings to use the Proxy.