On the downside, VPL-EX4 has relatively limited inputs. It comes equipped with two RGB-in, composite video-in, S-Video in, composite video-in, monitor-out, audio-out and RS-232C, but there’s no DVI-in, Wi-Fi or Ethernet connection. The benefit of two RGB inputs is that users can connect two PCs in advance and easily switch presentations by changing the input channel with the remote control. Signals supported comprise NTSC, PAL, SECAM, NTSC 4.43, PAL-M, PAL-N, and PAL60 (automatically/manually selected), while acceptable video signals include: Computer (fH: 19-92 kHz, fV: 48-92Hz (up to SXGA+ 60Hz)); Video (15kHz RGB/Component 50/60 Hz, Progressive Component 50/60 Hz, Composite video, Y/C video DTV (480/60i, 575/50i, 1080/60i, 480/60p, 575/50p, 1080/50i, 720/60p, 720/50p)). Resolution maxes out at 750 TV Lines (video) and 1024x768 pixels on RGB.

Corporate users will appreciate a number of built-in security features. In particular, the Password-Authentication System means that once you set a password, the projector cannot be used without it - even if the power cable is removed. This function, or course, prevents unauthorised use of the projector. The control panel on the top of the projector can also be locked, preventing inadvertent or unauthorised adjustment of the controls, and support for an optional ‘Kensington’ type security cable adds further piece of mind in a busy working environment. As mentioned, it is even possible to connect an optional security cable such as anti-theft chain or wire.

Easy to use with a practical resolution and brightness, the VPL-EX4 should suit all but the most demanding office environment. It also has environmental benefits - with its very low power consumption of 5-Watts in standby mode - along with auto standby selection, making the projector relatively eco-friendly. The only running cost is the lamp. Sony claims a lamp life of around 2000/3000 hours in high/low mode. Replacement lamps cost a not-so-cool £300. There are better projectors on the market for imaging professionals, as well as for those presenting lots of fast-paced corporate videos (the contrast ratio is just 300:1), but the VPL-EX4 looks good and it is actually pretty good value for money - a statement you’ll rarely read in a Sony review.