After trying several different bibs, I decided on these. The price appears reasonable, the chamois quality is comfortable and supportive, and the material is generally of good quality. The pockets are particularly convenient, with one on each side of the leg, and are ideal for carrying gels or power bars.
In my opinion, these are an excellent choice for gravel or road cycling.
For reference, I am 5'10" and weigh 172 lbs, and I ordered two pairs in a large size.