Ok, so for many reasons, I gave up on the Samsung Infuse I've been using for almost the last month and came back to Blackberry. Specifically the 4G Torch.
The Infuse's WiFi hotspot feature was very nice, however. I could get up to 3000 kbps out of it here where I live. I've since changed my plan over to tethering on the Torch, but I've only seen up to 86 kbps out of it, over USB, in the same location.
What gives? Is Blackberry's tethering really THIS bad? I've tried tethering through Desktop Manager, without, Bluetooth, USB, etc.