This looks like many of the round column Mill Drills.
Your HF mill is a "square column" mill. These allow you to move the mill head up and down the full length of travel and still stay aligned in "Z" ("zero'd" in). Many people like these, but I want to make that apparent to you.
If it is a really good deal, it will definitely increase your machining capabilities. It is much beefier than your HF Minimill, and has a much greater work envelope, table size and movement.
Just be careful that the 5 inches of spindle travel is enough for the work you are doing. Otherwise you have to move the head up on the round column and "zero" it to your work again.
Bernie