I had the Compact Electro Plus C2 (or something like that) for the past few years. Just sold it on Facebook marketplace for a fraction of the purchase price, so for me the answer would be no. It has great suction, sure, and seems to hold up really well. But the bulk of a two-part machine drove me kind of nuts, and it's very awkward to store if you have limited closet space like me. It was also annoying to maneuver around furniture (I live in a smallish apartment with a lot of small bits of furniture like side tables, plant stands, etc. rather than a few big pieces). As a result, I avoided vacuuming because it was a hassle, would often leave it out instead of wrangling it back into the closet, etc. So my apartment was overall more full of cat hair and dust even though I had a top of the line vacuum.
I also disliked buying new bags and filters all the time. But, if you're looking at Mieles you probably already want a bag kind so that's implied.
I replaced it with a dyson portable stick vac. I know that a bagless isn't going to last as long, and I can tell the suction is a little less, but it's so agile and maneuverable I use it multiple times a day. It doubles as a handheld without nearly the space for add ons that the Miele required. The suction is totally up to the tasks I need (keeping the cat hair and bits of litter from building up anywhere). And, since I enjoy using it and it doesn't feel like a pain, my house is cleaner as a result. And at less than half the price of the Miele, I can buy a new one every 4-5 years if I need to and feel fine about it.
