Perhaps not as techie as you may think. It's superior in ease of use to the Java and native IRC clients that preceded it. I was part of a site that used it to provide new users easy access to the IRC room; in that case, it would be less technical visitors using the mibbit (iframe) interface. Many of these sites were previously using Java applets, but the only one I generally see has poor usability and can be quite slow. Mibbit is a very strong alternative for non-technical users in this case. I haven't even addressed the case of people using it to get into IRC in general, which is also probably going on to some level.