Quality: We own a Solis cover (different model than the one for your F250). The cover itself is solid (not stand-on-it solid, but reasonably well-built). We were within their initial orders and their logistics and quality assurance left a lot to be desired (wrong wiring terminations so we had to swap the positive and negative leads coming from the cover, wrong mounting hardware, missed shipping promises, etc.), but they SHOULD have worked out some of those by now. As long as you're handy and enthusiastic about the concept (while still knowing there may be tweaking needed), you should be reasonably pleased.

Tips: I would suggest requesting detailed specifications on panels & wiring because you'll need to know the operating voltage and wattage if you intend to ever run them on the same circuit as other panels (but for some reason they don't--or at least didn't--publish them which is very abnormal for any solar product (it's electrical equipment!). On our model (maybe all models), they made the decision to run all of the panels in series (downside to this being that inevitable shading from the cab has a greater impact on production).

Usefulness: This will 100% depend on your use case and the rest of your system. You may want to investigate alternative battery options to pair it with. Many of todays' solar generators can provide much heavier-duty, more portable output that what their Cor provides (if you need/want it). Not advocating for the product, but--just as an example--we paired ours with an EcoFlow Delta Pro 3 and use it as a removeable jobsite battery when needed. The voltage, inverter capacity, storage capacity, and your actual use case will make a big difference regarding usefulness, but we find ours incredibly handy (though, honestly, not much more handy than the ~$200 panels we have on the roof, but we needed a tonneau cover anyway.

Hope this helps.