If you think too much about most time travel stories you can fly a galaxy class starship through the plot holes, and this one prompts many questions. However, if you suspend the disbelief and go with the flow, this one is pretty enjoyable. I like the pace of the story and how it builds to a good reveal.
Seven of Nine is the main focus and this works well. Jeri Ryan leads the relatively exciting sci-fi adventure charismatically and uses the no nonsense persona very well.
It is also a good Janeway episode and the numerous versions of the character contribute well in all scenes. Katie Mulgrew is great as always.
The guest character Braxon is written in a fairly silly way, but the performance by Bruce McGill lifts it significantly.
It is one of the stronger episodes for visual storytelling, with the cinematography and editing combining nicely.
For me it's a 7.5/10, but I round upwards.