I was using Beta 9 on the train today in my first "real world" test. It stayed connected better than my previous wifi tether app for my Incredible and the speeds were noticeably better than the last time I tried running it in a test environment (I was at about 8Mbps down, 1.5 Mbps up). However, I'm still not sure about this whole ad hoc thing.
Whenever I tried running tethering with encryption it would error out on me whether I tried iwconfig or wpa_supplicant. In order to get a solid connection I had to disable encryption. Of course, doing that allowed for RAYMA's, ShADoNNa's, and JaMeel's iPods to auto-connect shortly after we passed the West Baltimore stop... I enabled Access Control and only selected my laptop to be allowed, but I still saw the iPods listed as "connected" to my hot spot even though they had a red X next to their names. I couldn't see their devices listed on my network when I scanned it through Windows 7 though.
I guess my question is -- does anyone know if there's a way to successfully enable encryption, guarantee Access Control is working, or just hide the damn SSID? I pull enough bandwidth on my own each month without Rayma, Shadonna, and JaMeel streaming Pandora through my hotspot the whole way to DC...