We have been using GW Mobility (or data sync, whatever its called) with our androids with varying levels of success. First, we tried the native client that comes with android and users complained that they couldnt open forwarded emails (confirmed and terrible). So, I tried TouchDown client and thats better but still very iffy.. sometimes it takes hours for things you do on your phone to reflect in your mailbox, and vice versa.
So, would one recommend GW webaccess? Does it "push" emails to the phone or do you have to basically refresh it yourself?