Excellent. My Latin is crap these days, and if I had to read the original it would take an hour to get through a page with a dictionary open, but it's great to have the Latin right there if something in the English raises an eyebrow.
Buy the hardcover books. They are often available 2nd hand and are not expensive.
This translation looks good from a quick scan. Reasonably faithful to the text of Aquinas without being unduly contorted to track the Latin structure. A nice effort!