I've been using them for years and never had a problem. Compared to the old type Meile, they were a bit more limited in suction (12%), but now that Meile have changed their bags their suction is about 25% stronger compared to them. A big difference that you can feel with your hand. (I used a CPU fan connected to a fan monitoring program for comparison.) This bag also seems to be filled with more junk than the factory bags. The orange indicator also seems to respond better with Filtrete bags. The two fabric filters must be cut as with Meile. I am buying the activated carbon HEPA filter type SF-AH30 for the Miele S300-S600 S2 S7 vacuum cleaners. From Green Label. Save over $35 each year and change the cloth filter with every new bag purchase. I bought both HEPA filters and can't tell any difference in performance. The only drawback is that a little fine dust collects under the bag, which I have not seen with Meile bags. It appears that this dust does not become airborne and is not blown back out of the exhaust pipe. It only happens in one spot on the rear left, so I think it's a design flaw that allows that fine dust to sweat where it hits the static-charged plastic floor. I'm just assuming it's not serious anyway and my wife never noticed. The product fits great and seems to perform much better than both versions of the Miele bags (as of 04/24/13). I can't find any reason not to love her.
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