I'm very pleased with them.
Doing front and back at the same time means when the rotors are brandished / bedded, they all get bedded at the same time. If you don't do all four, there's really no way to bed the front but not the back... Maybe I'm just over thinking it, but when it comes to brakes I prefer having significantly better than stock breaks.
On my 94 GT, it has 04 Mach 1 brakes front and back. My 03 Cobra has eradispeed rotors and hawk pads. I just like the better brakes over stock. I'll also be towing these cars in an enclosed trailer with the expedition so wanted the extra stopping power.
You're overthinking it. You could take 20 vehicles and do all kinds of different methods of doing all four on some, doing just the fronts on others, just the rears on others, doing the some places recommended burnishing procedure, and other places that don't even recommend that anymore.
When you're all said and done there would be variations and no significant proof an increased or decreased stopping ability and then whatever results you had in the first days two maybe three, would very well be totally different 3 weeks down the road and for the majority of the life of the brake job you just did which would you be more consistent.
I'm just going to sum it up with an overall general statement and I have noticed that people do over the years. Many people choose to spend more or do more on braking systems since it is a braking system and it makes them feel better and gives them more confidence in their brakes performing correctly or performing better. This doesn't mean these people or even a majority of these people or any certain percentage at all actually achieve or realize or ever put to the test or need this increase performance.
In most situations stopping an extra few feet is not a matter of the braking components but more a matter of pushing the pedal harder or getting the pedal pushed firmly more quickly.
I fully understand where is thought process comes from but there is really is no conclusive proof on passenger cars and it is considered perfectly ok and safe to do just one axle at a time as it needs it.
I have also done all four brakes and rotors before on a very heavy vehicle that I wanted it to have the best copy ability. Whether or not I gained any percentage of stopping ability it's really hard to say.