The IS350 was just tested by MotorWeek! Thanks to XanaduSC for the find and jet864 for the transcribing:
Here is the info I found. It's episode #2506. It's cool that you can order a video too in case you miss it.
Can't link the website as it's a pop up. Here are the details.
Web site: http://www.pbs.org/mpt/motorweek/
Episode description: Road test the smaller but still robust 2006 Hummer H3 and the all-new 2006 Lexus IS350.
More about MotorWeek...
Rating: [TV-G] General Audience
Airs: (All times EDT) Saturday, Oct 15 at 4:00 pm
Saturday, Oct 15 at 4:30 pm
Sunday, Oct 16 at 3:00 pm
Wednesday, Oct 19 at 4:00 pm
$19.95 plus $4.95 shipping per episode; MD residents add 5% sales tax.
Maryland Public Television
11767 Owings Mills Boulevard
Owings Mills, MD 21117
jet864 said:"'Butter smooth' describes the IS 350's V-6 and, as you can gather from its 5.5 0-to-60 times, it's quicker than just quick. This is a full second faster than a 330i and the 280-horse G35. The six-speed auto is a worthy partner; shifts are crisp without being harsh in Drive mode or when playing the paddles."