Its mad they couldnt give away GX4000 at one point. I got one. Wish I never did at the time depsite some good games like switchblade. I took mine apart for the joystick ports. And recently found out they are quite rare now.
Some people have managed to mod a GX4000 into a full CPC6128+ by adding on the various components. At least the console came with a standard RGB video out (via SCART) instead of a proprietary connector :-)
But the technology was old by the time it was released. A faster CPU and better graphics (even though they were improved somewhat) would have done a lot to make the console more desirable.
And the marketing sucked.