I really like Kuat's products. Bomber build, easy to assemble, good looking and very well thought out. Fairly expensive, but as usual it seems that you get what you pay for.
Great deal on the two bike add-on from BTD.
If you are purchasing this you probably have high end bikes anyway so it wont be a problem but the weight capacity is around 130 so you wouldnt want to put a motorized bike on it. Our original 2 bike mount was purchased over 3 years Ago and the new extension worked perfectly