[cillian64]

I had that style of integrated panels installed on my (Victorian) house in the UK. The slates were old and crumbling so needed replacing and doing integrated panels meant only needing a fraction as much slate which saved a chunk of money. I think the result also looks a lot better than non-integrated panels, at least with slate roofs (which are common in my area)

Apparently integrated panels can be a little less efficient in hot weather as they don't get cooled by airflow under the panels and are less efficient when hotter. But it's a pretty minor effect, maybe a few percent of output. Seems like the best option on a new-build or if you're re-roofing anyway.