Just to make this VERY clear. The 'broken plastic QR' debate IS NOT about "you're gonna die!".
The worst-case for a recreational diver would be that a QR broke whilst load-bearing out of the water. Buckle/QR breaks and the heavy scuba kit lurches around or drops. It could cause an injury to the diver or a bystander... or damage the scuba kit.
A broken plastic buckle at any other time out of the water will lead to a PITA situation, where the kit will need repair. This could spoil a dive trip or holiday.
As for in-the-water QR 'catastrophic' failure... it is quite unlikely. The harness shouldn't be bearing any/much load underwater. Even if a QR does fail, it shouldn't cause a critical incident for the diver concerned. However, for a novice or nervous diver, any failure of any gear could lead to stress and increased danger via panic.
IMHO, the 'plastic vs metal' debate is about purchase considerations... where a diver might logically want an 'optimum' material solution in the contruction of rugged scuba kit.
In contrast, the 'Hog vs Complex/Deluxe' harness debate is about differentiating between what a diver wants and what they actually need. Most divers don't need anything more than a basic Hog harness. With that choice, they gain the benefits in terms of expense and ruggedness. Some divers do actually need a comfort harness. They are a small majority with specific requirements, such as severe upper limb immobility or regular, extended walks to/from dive sites.
The rest of the divers who opt for comfort/deluxe harnesses do so simply because they want one. If a diver wants to buy more complex, more expensive, less rugged equipment to solve a simple requirement, then that is their perogative.
Heard this joke?....
That joke sums up the Hog vs Comfort Harness admirably.
Very Well put Thank You. Opinions are just that Opinions. Everybody has one and is free to share it here but some of the arguing points here are just silly. Who cares if an "unloaded" plastic buckle does not break, it gets heavily "loaded" to and from the water. Stating that plastic buckles may mean life or death is again silly.
As DevonDiver stated it is really a matter of preference. An opinion no matter how you come up with it is yours. If you have tried the QR's and dont like them or feel that they are "unsafe" that is your choice. The beauty of this board is that there is more than one person answering. If you have tried the HOG and dont care for it and want the comfort and QR's then good for you. That is why the market has choices.
For me and it is my choice I think I am going to use the Pencil.