I have been using Infomaniak services for a few years now. I have my email with them, several domains and use Kdrive almost exclusively these days. Talking about Kdrive specifically, it is fast and has all the typical features you would expect from these types of services. The cloud side with the office integration is really good too.
If anything, the only negative I can find at the moment is that the app does not offer a lite mode (download as you need) feature for Linux so you have to download everything. That said, it does offer a WebDav feature which integrates well.
As for the kSuite, I would say you only need that if you are using it for business. Otherwise the solo or family package would suffice. I have kSuite too and it has some additional features but nothing you would need as an individual.