Anyone have a mini split A/C ?

[Too Many Projects]

I just ordered an 18,000 btu Pioneer unit. I built my previous shop into a hillside. Sidewalls started at 4 ft and stepped up to 10 as well as the back wall at 10' below grade. Even in 90 degree heat, it stayed a constant 72 degrees, as long as I kept the doors shut.
My new place is fully exposed to the sun all day and has a dark green roof. The past few days of upper 80's and low 90's has had the interior temp climb to 82-3 degrees. I had this issue most of last summer too and can't stand working in there.

Anyone have one of these units that is happy with the performance ? I'll be cooling about 1,000 sq ft with 12' ceiling. Building is heavily insulated and holds heat in the winter very well.