I have put Grohe faucets in all bathrooms and kitchens in my last two houses. I have been in my current house for almost 13 years. So, all four faucets(three baths and kitchen)were installed 11-12 years ago. No issues so far.
I replaced both shower heads with adjustable spray models made by Seimens. They are also both about 11-12 years old. No issues. I have hard water too(calcium and some iron).
I also replaced all three toilets with American Standard 1.6 gallon comfort height elongated bowls. One is their Cadet model. The one they show flushing the bucket of golf balls at trade shows. This toilet works incredibly well. It has a different flushing method than the standard flapper. IMHO, it works great.
Grohe is a good German brand, I don’t know if they kept with it but years ago they were reaching out to the repair industry and trying to build a system for parts to be available for repairs, something that Kohler thought was beneath them. Kohler snubbed the repair industry and so their high-end consumers suffered for it.