1st and foremost, they are efficient. Out on the patio, they will run all day with a small'ish receiver while streaming, etc. 2nd, they can be improved with a little DIY and some common sense. 3rd, they are the perfect speaker to get your toes wet while learning speaker improvement
When you get them, do a really good once over. Open up by pulling the woofers. Look over the cab overall. I think you'll see that they are not "substantial" like many higher end speakers. It makes them easier to move around, but takes away from the drivers doing their job well. Cab flex is a real thing. All the panels are mostly intact, except the front, with all the cut-outs. And that's the most important...
First thing I'd do is to add some front/back braces. I'd use poplar 1x2's because it glues well on the end grain. Good glue and a firm fit. Black sheet rock screws through the front and back panels to hold while the glue sets. I'd do one above the woofer and one near the mid-range, as high as you can reach.
I'd check the foam surrounds. If any feel or look iffy, I'd redo them. Recap the X-Overs and add some polly-fill pillow stuffing to eliminate internal reflections.
By the time you are done, they will sound a LOT better. If you can, add a base to each getting them up at least 1/2 woofer dia off the floor/deck, and I think you'll be really pleased for BBQ and Party speakers
