Back when I was a kid a few kids i knew had the G7000 I think it sold pretty well over here, probably better than the Intellivision and Colecovision to be honest, I never knew anyone have one of those back in the day, only saw Colecovision on display in Woolworths along with the Vectrex. All the big outlets used to have G7000 displays, Rumbelows, WH Smiths, John Menzies etc. I think like all the consoles over here by the time Philips pulled the plug in 1984 the computers had taken over the market and that was somewhat struggling, remember Dragon, Oric & even Sinclair colapsed about then, cheap cassette games took over from expensive carts. I have seen some new in box G7000 games on ebay still with Menzies £7.99 stickers on but when this price was current I have no way of knowing.
As to the machine itself, I recently got a boxed one from ebay with 10+ games for less than £20. I am really enjoying it to be honest, the graphics are simple but nice and clear and bright, the RF output is exceptionally crisp and clear, the animation is also very smooth and no flicker. The games I have are a mixed bag, Munchkin and Crazychase are very good, Turtles is also very fun. I also got a complete Quest for the Rings(the hybrid board/video game) that I have yet to play, the physical presentation of the package is however superb, lovely thick board, beautiful manual and metal game pieces, best video game packaging ever!