Overall, the best commentary as I taught through the book of Joel (Did not reference/consult Obadiah portion). Busenitz contributes plenty of insightful textual remarks that will enlighten anyone studying Joel for a teaching/preaching series. Busenitz spills a lot of helpful ink discussing the Day of YHWH as it is central to the book. I also consulted Douglas Stuart in the WBC series which was my next go-to on Joel. He also had very insightful comments on the text, although he has some interesting and unique views (for example, he takes the locusts in Joel 1 & 2 to be figurative for an invading Babylonian army). I also used Raymond Dillard on Joel in the Baker Minor Prophets series and the Keil & Delitzsch volume on the Minor Prophets. Both had good insights, but overall weren't on the same level.
Some stances Busenitz takes on key interpretative issues in Joel:
- Argues for an early date of the book, sometime in the middle of the 9th century BC
- Takes the locusts of Joel 1 to be real, literal locusts that have decimated Israel
- Essentially argues Joel 2:1-11 is an eschatological army being described in "locust" terms (the historical locust plague is simply a precursor of the eschatological "locust" plague to come)
- Takes Joel 2:18ff to be describing the "prophetic perfect" i.e. not events that took place past tense in Joel's day, but still to come in the future
- Has an excursus on Joel 2:28-32 and its relationship to Acts 2:17-21. Takes a partial fulfillment/initiatory view with a complete fulfillment of Joel's prophecy yet to be fulfilled around the second advent