Free Market Fairy Tales has a post with a long list of complaints with harris bipods. Harris is the benchmark other bipods are compared to.
1) The attachment to the rifle is insecure and insufficient.
2) The bipod is difficult and extremely time consuming to attach to the rifle.
3) The bipod is extremely difficult and fiddly to detach from the rifle.
4) The bipod is noisy to deploy
Many more complaints here.