Amazing - buy one! And before you ask no I'm not affiliated with Global Cache.
I bought the wifi2ir model which is perfect for controlling my kdl-w4500 bravia, denon avr2802 and sky+hd box. Although prepare to spend some time tinkering with commandfusion's guidesigner getting button configurations setup to suit you tastes.
Now I can't wait to get my hands on an iPad as that will look way better sat on my coffee table than my beat up iphone.
I'm using commandfusion's iviewer. If you need RS232 then a GC-100 would most likely be a better option. But if you did buy an ir itach you can always add extra units a later date for rs232 or relay. Another really cool feature with the itach is that it can be powered via usb so I have mine plugged into my skyhd box drawing power from it's unused usb port. Result