Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Troy bar versus standard curl bar

The Troy Bar accomplishes what it's intended to so. It facilitates the widest range of wrist rotation removing the strain placed on tendons when doing curls with a straight bar. And the 360 degree rotation lets you switch from bicep to forearm curls on the fly. It is however harder to control than a standard curl bar and because of it's shape not as flexible for doing anything other than curls so you might want to weigh that against the fact that it costs 3 times as much. Standard curl bars also facilitate forearm curls however not on the fly as you have to change grip.