I had the old 2Gb version and then later on the last batch before production ends.
The newer batch with 8Gb has slightly better built quality after they managed to get a better company to manufacture the exterior. The sound is the same for both 2Gb and 8Gb model, as they are all superb sounding.
The GAME (GanQi Amp Module for Earphones) is a separate purchase, but as you can see from the other head-fier's answers, it's not all IEMs that will have hiss with the Standard V2.0 module. My reference in the earlier post is EarSonics SM3 and the Ortofon e-Q7, who are both producing hiss w/ Std. amp.
If the seller doesn't specifically state that the HM-801 comes with the GAME amp, then I would expect it isn't included in the deal.
BTW: Note that there are 2GB and 8GB versions of the HM-801. The latter are newest. Finish is also a litlle different, but nothing to worry about.