Useful enough for me and my crowd (Neuroscientist). I've not had many users complain (none actually) that they had to install Firefox or Chrome. Mainly because

Useful enough for me and my crowd (Neuroscientist). I've not had many users complain (none actually) that they had to install Firefox or Chrome. Mainly because the tools we useful enough that the effort was worth it to them. I think if the games and toys are enough fun, people won't care that they have to run it in a different browser. Hell look at how many people buy new computers just to run the latest games. 3D on the web in my mind will be most useful for games and I believe scientific visualization and engineering applications which are usually people who don't care about installing a different browsers.