Unfortunately, the VAIO L isn't as good a touchscreen computer as it is a TV. Not only does the computer's stand not let it tilt very far backwards to accommodate input, but it's also pretty finnicky about actually being touched. I found that if I didn't carefully pull nearly completely perpendicularly from the edges of the screen, the computer had a really difficult time recognizing my gestures. With the Core i7 processor, the machine was actually surprisingly responsive despite lacking any solid state drive, and also booted into Windows in about 20 seconds and woke from sleep in three. There's a bit of software bloat, including a particularly annoying trial copy of Kaspersky security software that expired as soon as I started the machine and incessantly warned me to upgrade, but overall it's a solid PC. It's got a pretty decent array of ports, including three well-spaced USB 3.0 sockets on the left, three USB 2.0 ports in back, HDMI-in, HDMI-out, Gigabit Ethernet, a card reader, 3.5mm audio jacks, and even a FireWire 400 port for some reason.
The IdeaCentre B Series touch screen computer measures 56x42x8cm. The viewable screen is 50x28.5cm giving the notional diagonal imperial measurement of 23 inches.