In addition to the cant feature, get the notched legs. The sliding type legs are more adjustable, however, it is a PITA to get it to stay where you want them. I've had the cheepo caldwell for 3 years now and it has served well enough for coarse shooting situations.
For real solid stability off a bipod, do not expect world class, repeatable, groups with the cheepos or even a Harris. They are OK for plinking and such, but for real stability you need to spend much more for something with more quality.