The M91z's 21.5-inch screen is glossy and bright, though it's not a touchscreen (which is something many of us associate with all-in-ones). Viewing angles are particularly good on this machine, and you hardly lose any of the image horizontally or vertically, but the display's glossiness is prone to reflections. Still, color looks good, and video playback also looks good. I did spot compression artifacts in full-screen HD video playback--especially in darker scenes--but that's not surprising considering the lack of a discrete graphics card. Audio playback on the M91z is also pretty impressive: very loud, if a bit tinny-sounding at times.
The entire machine sits at an angle, propped up by a small, yet sturdy plastic stand. Two small feet are at the bottom of the computer, keeping the bottom of the screen about an inch from your desktop. These feet make the computer look a little awkward, and take away from the otherwise attractive design, but they do allow you to slide your keyboard under the screen for storage.
Ports are situated on both the side and the back of the M91z. On the left-hand side are two USB 2.0 ports, microphone and headphone jacks, and a card reader. The back has four more USB 2.0 ports, for a total of six, as well as an HDMI-out port, a VGA-in port, and an ethernet port. While you can use the HDMI-out port only to extend your desktop onto another display (or mirror it), the VGA-in port lets you use the all-in-one's screen as an external monitor.
Our review model came with two wired accessories--a USB-wired keyboard and a USB-wired mouse. The keyboard is a flat, matte-black chiclet style affair with red accents. The keys are flat on three sides but have slightly rounded bottoms. Typing on the keyboard is comfortable and the keys are quiet. The keys don't have a lot of feedback, though, so you may experience a lot of typos. The function keys are all, by default, special buttons rather than function keys (Apple does the same thing), and pressing the Fn key will get you the typical "Function key" actions. The special buttons include audio and media controls, as well as lock, refresh, print, open, and search buttons.
The included mouse is basic: light, rounded, optical, and with traditional red Lenovo accents. In this case, the mouse's scroll wheel is red and similar in texture to Lenovo's signature pointing stick.