I bought iracing just yesterday. I got the 3 month pack to see what all the hype is about and I have to say...im a bit underwhelmed so far.
I've tried the 3 default cars as well as the mazda star. For me none of these feel quite as accurate as the LFS cars do. The force feedback through the wheel is a bit lacking, especially when you lose traction. You can see the car sliding on screen but you certainly can't feel it. Not the way you do in LFS anyway.
I don't think much of the interface either. The setup screen is crap compared to LFS and there really isn't many features.
I realise that the idea behind iracing is the clean, competitive racing. But I'm not real interested if there is something like LFS that feels better. Too bad iracing has all the tracks and all the content
I'll keep trying it over the next few weeks but not real interested in it so far.