My IS 300 was stolen and totaled so was not in the market for a new car. Test drove the IS 350 and hate that it was not manual. I was told good luck finding an IS 250 with manual trans. I found one and it's just a great car. So, much different than the IS 300.
Keyless entry. It's fast.
More backseat room. Mine doesn't have AC/heated seats, would have liked that.