Build quality and feel is top notch - well above its price point. However, as other customers have noted, the screws on the base loosen, resulting in slight play on the handles. While logically there's no immediate risk, it's a little unsettling to have $3,500 worth of gear hanging from this twisty handle. Other users have reported that using Loctite solves this problem. Another small note is that the angle of the arms isn't 100% parallel - it's very slight as it's only noticeable with OCD, but when you set the camera up you tend to experience OCD. It's not a serious problem and I quickly forget about it after driving. It ends up with a solid construction that's good for the price and it gets the job done. Dogbone extensions can also be useful.
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