LWD barrel offer more support than the Gen1 & Gen2 barrels. Late in the Gen3 production Glock Inc was making feed ramp changes and catching up with their support. Gen4 barrels are pretty much fully supported.
We have lost a few barrels to KB however none were attributed to materials or workmanship. They were ALL directly related to improper reloads.
LWD offers several types of porting. See a few choices here http://bit.ly/k2lDXa