D&D 5E Summon Fey cast at 4th level gives a HUGE boost in action economy.

[Lyxen]

Other than that, it is quite a strong spell

Indeed, and it's a fairly versatile one, with the various powers of the fey, when used outside of combat. Also, because the form is not defined (a fey creature of your choice), you can use it in social or intrigue encounters, or simply as a companion.