This is tough sledding, but it's a beautifully done edition. The Biblical passages followed by Onkelos followed by Rashi followed by Rashi's often telegraphic commentary translated into good English, followed by material translated from commentators on Rashi and/or the editor's own comments elucidating what Rashi was driving at. The reader needs to bring some comfort in dealing with Biblical Hebrew grammar and some intuition about what Rashi is concerned with.
[After finishing.] Having finished this, I've gained a huge amount of respect for the breadth of learning of this great scholar. He lays out the problems in each word and phrase and brings an astonishing wealth of erudition and ingenuity in solving them. His solutions will often strike the modern reader as forced and/or fanciful, but no one can deny that he was a titan of learning. Let's recall that he didn't have access to libraries (not to mention Google) and much of what he wrote was likely from memory.
The English language elucidations seem to my am haaretz self to be well informed by traditional Rashi scholarship. Highly recommended.