Well, the reality is, most aftermarket parts are extremely sub par in comparison to OEM, OEM parts are what should be required to be used for any vehicle newer than 5 years old. Most insurance companies only deem OEM to be necessary on cars 1 year old or newer. I have seen aftermarket panels with defects from poor welding to warped panels to panels too thin for the location the vehicle, poor fit and finish is to be expected. Consider it the same as the difference between a top dollar name brand body kit, compared to a cheap knock off. If you are ok with your insurance putting a cheap Chinese panel or anything else for that matter on your $50k+ truck, be my guest. I'll be taking my truck to my shop that i know gets the job done right.
Also, if anyone thinks the few and far between of people like myself that find a way to make the insurance make the repair right, rather than use the cheap aftermarket parts, uve lost your mind. Insurance will screw you any way they can. I had a friend use the "snapshot" crap when it first came out. He got a new job that made him have to drive 15 miles further each way, got in an accident, and was denied due to not informing the insurance company that his daily driving distance changed.
The reality is, in most cases, you dont have to settle for what the insurance company wants to give you, because what they really want to give you is nothing, and they try to make you settle for the bare minimum.