It differs from its ancestor YiiBooster, that it requires Yiistrap to work. Chris and I thought that this way would be easier to maintain, scale: leave bootstrap specific development to one library, where the other will focus on widgets creation.
Yiiwheels also encapsulates each widget on its own space, so its assets are published only if required. This way, you wont suffer delays because of publishing.
web development has never been so fun