there's lots of conversation about wheel offsets here. Not to sound like a pointy, but do a search.
here are the facts:
1. 15x8 in a +0 will sit outside the fender of the car.
2. with stretched tires (195s) and a reasonable amount of camber, people are running them on suspension that is lowered significantly. In order to do so, you need to roll your fenders. In some cases, people are pulling them too.
3. +0 offset changes the scrub radius of your suspension pretty dramatically when compared to +42mm. So these wheels WILL wear out your wheel bearings faster than the stock ones.
4. The car will experience more bumpsteer and tramlining than with the stock set up. Some people claim this is insignificant. Others do not.
5. Running more tire with these wheels will induce interference between the tire and fender without a flare.
Its kind of like arguing religion. Theres not a lot of a point. Some people "get it" and others "don't". A lot of people here are pretty defensive of thier wheel/tire choices.
I personally amy doing something in between. I'm running 15x8s with a +15mm offset. I will be running Yokohama A005's on them in something similar to a 230/45/15. I run Tuckin flares, and I am actually worried about the fronts not having enought clearance.