My personal observation about the personal hotspot activation in iOS 4.3 is that it is better than the jailbreak MyWi 4.0 application. There seems to be no difference in speed one way or another, and no difference in latency one way or another. However.... When connected via USB, there is no longer the occasional system OSX 10.6.6 crash the way that there was with iOS 4.2.1 + MyWi 4.0. Works effectively for extended periods with no issues. Bluetooth: It has been easy for me to connect via Bluetooth networking on both the iMac and the MacBook Pro. It was impossible for me to do this with MyWi and iOS 4.2.1. I have no idea why...I just never could do it. An extra advantage with Bluetooth appears (in my observation) to be very low battery consumption when compared to WiFi. If you cannot tether to your computer, this seems to be a good way to go, just to save the battery. WiFi: Just as good as MyWi. Same speed, same easy connectivity. Provided you don't think you have a need for more than 4GB of data, I can definitely recommend this!