TL;DW: He says the device is amazing on many fronts, the size and controls are great, the trackpad is great, the performance is great, the screen is great, but...

The fans get loud and the device gets ludicrously hot under stress or long playtimes. The thermal camera shows it can get around 50°-60°C (!!!) where your hand would be on the top. The heat in the internals are fine, even at 25W the temperatures were under 80°C, but he says the device gets just too hot to recommend.

Worth noting that this is a preview build and GPD have told him they are working on insulating the heat, but as it stands he can't recommend the device until the issue is confirmed to be fixed. A shame.