I've only seen the G3 & 4 which I have. The 3 is much nicer looking I think than the dark 4. Which reminds me I still have to replace the back wheels on the 3 which have lost their rubber coating causing it to spinout on carpeting, Charlie W was kind enough to send me a set of replacement wheels. Prior to getting the house we were staying at my mothers, she's 82, and while she liked the ease of use with the self propelling, she couldn't manage it into our out of her hall closet very easily, lifting it was totally out of the question for her and she's not feeble by any means. She much prefers the 2 Panasonic Jet Flo's I got for her upstairs and downstairs.