Instruct: Classify a given Amazon review into positive or negative sentiment.
Query: Be warned

I bought this item based on previous positive experience with Kensington products. This product however greatly failed. The unit comes with an insufficient AC adapter. I used this hub with just my iPhone and a USB mouse. I plugged the hub into my MacBook Pro. After barely 1 minute (literally), my mouse did not work. Using my trackpad, I found that my iPhone was no longer mounted. I unplugged the hub from my laptop and plugged it back in. It worked fine - for another minute. The hub is greatly underpowered by the AC adapter. I was only using two ports on it. And this is supposed to handle seven connections? Don't buy it. I replaced it with the Belkin 4-port Desk Hub and it works beautifully.