KBS911

Just curious. I noticed on the build your Porsche web site that there was an option for wheel spacers. Didn't think much about it then I was browsing through the H&R springs website and noticed that they offerred them as well. Said that they improved handling, wider stance and so on. I remember putting these on VW's back in the 70's. Question is has anyone added them to their 997 and if so what do you think? What if any drawbacks are there to spacers?