Well, I'm new to jailbreaking. For the first time, I jail broke my iphone 4 and my ipad. the main reason was to be able to use the new ondemand mywi. I must say, I am impressed. I only have a wifi ipad (it was a Christmas gift) and was was a little unhappy about not having internet connectivity when away from a wifi connection. Now with Mywi with ondemand, I now have the internet connectivity. It works great. To answer a couple of questions posted here...I only had to pay for it once. Both the iphone and ipad are now running licensed copies. And it was easy to set up, and now, when I have no wifi connection, as soon as I unlock my ipad, it automatically connects to my iphone via bluetooth and the internet works. And then, when I lock my screen it disconnects. It works as advertised and now I have unlimited data on both. The app is pricey, but really it isn't because I would be paying $25 per month for 2gb of data for my ipad if it was 3G. Or, i guess I could wait till ios 4.3 and have native wifi hotspot, and give up my unlimited data on my iphone, and then pay $45 per month for 4gb. Nah, on second thought, I will stick with Mywi.
Anyway, I was not a mywi fanboy or hater. I have never used it before. Just saw an article about it and gave it a try. It does what I expected. And more.