I added google checkout last night, what a low quality of support and docs for intergration that has, even the example code does not work, still really nice server side interface though so much better than protx.
i would tend to think that shistos is full of shit, since whilst the website was loading it was pulling images etc from a directory called 'shistos' on the web server... basically it's just his own site, probably a drop shipping site straight from dealextreme at that.