The one other physical difference has to do with the built-in cable management and honestly, the lower-end M1 might actually be the winner here. Whereas the F1 has two doors on either end of the desk that open to reveal electrical outlets, the M1 has all the outlets lined up on the back edge of the desk, along with some trays for managing all your messy cables. Personally, I like how the open outlet layout on the back gives users a little more flexibility in terms of where they put their various gadgets on the desk (meaning, you don't have to cluster them around the two port doors). My only complaint is that to plug your stuff into the outlets on the M1, you have to pass the cables through two slots carved into the far end of the desk. Not a bad idea in theory, except each slot has a bulbous opening at the end, making them look suspiciously like penises. I'm surprised no one on the company's design team caught that.
Feature-wise, the M1 brings a larger, 5-inch touchscreen (up from 4.3 inches), and it now supports multitouch gestures. That display is also now field-upgradeable, which should come as a relief to IT departments considering issuing these desks to employees. Additionally, there's a more robust processor on the inside that's said to be four times faster than on the original. Accordingly, since the F1 is supposed to be the higher-end model, the company also upgraded the original so that it too has the bigger display and faster CPU.
Whichever desk you choose, the UI is going to be the same too. As ever, you can hook it up to a Fitbit fitness tracker so that you can see how many calories you've burned while standing. Now, though, you can log in automatically over Bluetooth just by walking close to the desk. (You can still log in manually, if you don't have a compatible device, or don't have it with you.) In addition, your data is now stored in the cloud, not on the device -- a feature that should come in handy for businesses that run various satellite offices. For example, if I were to visit Engadget's San Francisco workspace, the smart desk there could import my user profile, much the same way any new Windows device can roam your PC settings. Lastly, the on-screen UI has been updated so that the settings menu is accessible with just one swipe, instead of several. Also, a new "lock" feature physically prevents the desk from adjusting up and down -- a usual feature if you're in a meeting and don't want to be interrupted.