Product liability law is a lucrative field, so it's attracted its share of shady lawyers. If you're ever concerned about a lawyer's qualifications, check to be sure they're a member of the state bar association; if not, don't hire them. You can access your state bar membership list for free through ishereallyalawyer.com.
Like personal injury cases, product liability cases can take a long time to come to trial, and a long time to litigate, especially if you're suing a large corporation with deep pockets. Dont give up if it seems to take too long; in some cases, it can take years.