I've never used the risky "maybe/maybe not" codes. It''s just not worth the stress and embarassment to maybe save an extra few bucks. There are plenty of codes on this thread that give a really good deal and are never questioned. In my opinion, if you rent often, you are better off to find a couple of "safe" codes that offer a good value and stick with them. Why even compare the rates against risky codes and be tempted with a slightly lower price that may or may not work? I've compared the high risk codes against my favorite codes (G417900 & A108386) and the savings are usually 5%or less. I also consider other code benefits in addition to price. Free LDW cap, unlimited mileage, free one-way, etc. In my opinion, renters that try every code in search of the absolute rock bottom price, without considering the risk and benefits issues are doing themselves a disservice.