Of those migrating to the iPhone from other devices, a good number of them are former Treo users who found Apple's device to be a souped-up, snazzier and even easier-to-use version of the Treo.
excellent; clever, ingenious, or adept in behavior, operation, or execution
الواصلة
excellent; clever, ingenious, or ad·ept in behavior, operation, or ex·e·cu·tion