I am the type of person that has to have the latest upgrade on everything that I have. I do not like having out of date products and/or applications. I tried different upgraders but they did not work. jUpgrade is a good product but I tried it on several sites and during the migration it either did not work on some sites or it did work. So I was looking for a consistent migration tools and I found it with SPUpgrade. I had a little bit of trouble understanding the instructions in the beginning but I contacted support and they responded immediately. One of my sites was rather large and the migration went well. You will have to do some clean up but that is to be expected. SPUpgrade does all of the heavy lifting and again they provide amazing support. This extension is well worth the money as I used it on at least 7 sites and it worked well on all of them. You get what you pay for. Good jobs.