Growing up and watching commercials in India, I always thought that it is illegal everywhere to make a commercial by comparing with a rival brand. However, it isnt the same everywhere - I see commercials frequently taking on each other without raising an eyebrow.

However, things in India are still kosher when it comes to taking your rival head on. I dont see anything wrong with what Rin has done, but I think others have a traditional take on these things, still.

http://www.afaqs.com/perl/news/story.html?sid=26407