No worries bro. As an FYI, there is a G Sedan section and then an 07 G Sedan section. Anyways, just glad you didn't get into an accident and that your ABS worked well.

Those were the ABS brakes saving your a$$

After you changed your pads did you bed them in correctly? Proper bedding is required in order to achieve optimal interaction between your pad and rotor. Also when changing to a different pad compound it's a good idea to remove the previous layer of brake material from your used rotor so you get a nice blank canvas so to speak. This can be done either by having your rotors turned very lightly or by using an aggressive race pad that is highly abrasive when cold.

definitely the ABS kicking in.. happened in my Acura too when i braked hard.. haven't tried it in my G yet so i know for sure it's the ABS

maybe the brakes suck compared to the weight of our cars?

I doubt braking hard from 10-15 MPH will cause any skipping and shaking. Reagrdless of what ABS is supposed to do, 15MPH is way too slow to cause shaking when you brake.

when ABS kicks in you can feel the pedal pulsating from the on-off cycles. This is percieved as shaking. Even if you're only going 15mph if the tire slips and the wheels are spinning at different rates the ABS will kick in.

just the ABS...with out it you would just skid.

well....did you hear the "thump thump thump thump thump" ??? that would be the ABS...and vibration is normal. Also, since you changed your pads....you should notice less aggressive bite and braking power...but you do gain the less brake dust that gathers at your car 1 day after you wash your car ( (a common problem for 03-04 G35s)...you give up braking power for less dust.....i think you should've noticed the difference since you already have 10k on them...