There will be no problem importing your TMG4 data into TMG7. I belong to a TMG User Group where one member recently upgraded and he had over 5000 people. You will really like the ability to make custom layouts for your screen, custom toolbar (just make a button for your commonly used tags or reports, the focus group (say you want to work on the Jones family who lived in Washington Co., MD; you filter the Project Explorer, copy the results to the Focus Group, and then save the group to continue your work at another time).
--bj