iPhone was hotly-rumored before 2007; iPad a frequent topic of debate prior to 2010; but it’s hard to argue that Apple Watch, reaching consumers’ wrists today, is the most controversial of Apple’s recent line-up. Even before Tim Cook & Co. announced the wearable in September last year, the pros and cons of an iOS-powered companion for your iPhone were splitting party lines, and that debate hasn’t eased any in the months between then and release. Now, though, the waiting is over. The preorders are arriving. And Apple Watch needs to prove to us it’s worth a spot on our arm.