Looks like they are still very good. I have the C1 which is still made in Germany. I wouldn’t buy a model made in China, regardless of manufacturer, but to each their own.
https://www.reddit.com/r/BuyItForLife/comments/1cban91/miele_vacuum_worth_the_cost/
https://www.rtings.com/vacuum/reviews/miele
The biggest knock Rtings has us the cost of operation (filter and bag replacements) but you can get reusable options for both. I have two very sheddy dogs and one reusable bag has worked fine as long as I’ve owned the vacuum.
Advice for any purchase really that I learned far to late, cheap is expensive. A $400 vacuum that is made well, repairable, and will run for 20+ years is better than a new $120 vacuum every 5 years.
Additional statistics about the IRA, which Trump and Vance have vowed to defund, from E2 two years into the IRA:
https://e2.org/reports/clean-economy-works-two-year-review-2024/