I think you'll be fine. I have one, used it sparingly thus far, but like it. If I were to critique it, I would ask that the stem be a little stiffer. It needs to be very flexible to follow wheels contours/crevices, but stiff enough to allow you to impart force against the wheel. It does that fine, but if it was a little stiffer, it might be that much better.
Others have commented on the tip. Seems typical of these would wire stems used in various products, even outside the detailing world. I have the same type stem that are used as saxophone cleaners, the tips are also susceptible to coming loose. So far, mine hasn't come loose. If it does, place it back on the brush, use adhesive or call AG.
Autogeek stands by there products very well. If you experience a problem, I am sure they would take care of you. You can feel confident in this purchase, based on my personal experience.
Of course, that's just my opinion....................I could be wrong!
See ya