What I do know is that I own a pair, they are well built, adjustable, and rebuildable. I have the single adjustable version. I'm going to assume they are entry level, but they are adjustable and I really think that most things are going to be better than stock, especailly at this price. Volume is the key for the price, and if their quality control is in check, they should be fine. I bought mine from a reputable motorsports suspension shop who deals with the range from bottom of the line to Ohlins, and they thought they were a very good value for the money. I have no comments on usage, as I have yet to have my car on the road, but I really think that especially the double adjustable has to be such a good deal for the money and compared to the competition. QA1 is either owned by or purchased Carrera, to give you an idea of what level they are at.
Jason
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