Does anyone use Truphone (UK app), The reports are good. Mainly want to use it when I am overseas through the wifi and local carrier.

Any comments welcome.

I have downloaded the APP now and used it a few times to call the UK. Sound quality is excellent through wifi. If you have no wifi and want to make an international call ie call to the UK, you dial the UK number and then it automatically dials a Swiss number and connects the call. So it also worls well without WIFI. My girlfriens has also the APP and aslong as we both have the app open and are connected to WIFI its a free call.
It is different to skype because it can work without a wireless network.