I did an extensive bit of research before I got this car. I list the pros and cons of the car vs. C-class and 3-series in hopes of it helping others with their purchase.
Much better equipped than either the C-class or 3-Series (The option prices on competition are too high).
More reliable than other brands (Lexus being the most reliable brand).
Dealership service is amazing (having owned Mercs and Beamers before, Lexus services you much better).
Running costs are very low as the car barely uses any gas.
The AWD package really helps out during winter.
I personally prefer the look over 3 series, I think the C class is better looking, but the IS is gorgeous too.
Lexus maintains its value better than the competition.
Parts are expensive, but still cheaper than both Mercs and Beamers.
Power lags behind the competition - I knew that before the purchase, but I wanted something more economical.
Second row seating is very cramped compared to the C-class at least.
Ride quality isn't as smooth as Merc or sporty as BMW.
Overall, I felt considering the options, the price, dealership, and the looks, the IS was a very good choice.