After looking at others, I opted to purchase the SPUpgrade after reading reviews esp. due to support issues (being a novice). I have migrated 2 sites--1 simple 4-page site and the other very large with many extensions which had to be re-uploaded. Not only was the component easy to use even for a novice like myself, but when I did run into issues, the support folks made every effort to assist with fixing it. I am on the very end of upgrading the large site and, sadly, the last component may not be upgradable but that is a different issue. I would highly recommend this product, it was worth the amount paid for it. In addition, I have one more site that I plan on using this for.