jUpgrade installs easily enough. So do most components/plugins.
Click the Parameters button to change jUpgrade settings. After you adjust your settings, click the Save button. You're not taken back to the main jUpgrade pane. Clicking Cancel does nothing. If you click in the address field and press enter (after clicking Save), it takes you back to the administrator back-end index page.
After confirming that I meet the requirements for jUpgrade (as listed on the developer's website), I click the Start Upgrade button. Nothing happens and no feed back is provided to let me know what if anything has gone wrong.
So far, jUpgrade appears to be form/style over function/substance.