I picked up my new IS300 yesterday.
First of all, I am not to mechanically minded, so dont expect the ins & outs of straight 6s.
As someone else said about their new IS, this car has a serioulsy large grin factor. :D
The engine note, in normal Drive or using the M shift, is fantastic. Kick down is responsive, particuarly with the PWR button depressed.
Loads of gadgets/toys...or safety features, depending upon who you are showing the car off to. Auto lights are fun when you go under a bridge.
I have an 04 IS300 in black, the tinted windows make the back the car look liek its been engulfed by a black hole, the wheels are the graphite 11 spoke wheels and the car is now adorned with a couple of LOC stickers...it looks rather smart, even if I say so myself. I will probably start a seperate post at some point as its so good.
Back to your questions:
Select PWR and the thing goes quick enough (for me), I think the 0-60 is 8.2 seconds. When I asked a similar question I am sure someone (Fargo I think) suggested NOS...eh yeah maybe.
I absolutley love it. I cant wait to go to an appointment tomorrow morning.
Heres my ultimate test. I see BMs, Alfas, Jags, Mercs and think to myself 'no, I definately made the right choice' and just in case, I switch to M and kick down a couple of gears and listen to that engine!