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I think the alternative base material is also meant to overcome the slipperiness too. As for the weight, clearly I have no way of verifying the figures and can only go by what I can find out - until I buy it of course!
Check out the following link to the retailer though, it says they weigh their own stock rather than take SMD's figure: http://antigravitygear.com/shop/shelters-accessories/six-moon-designs-lunar-solo-ultralight-tent/
They also have the standard Lunar Solo listed: http://antigravitygear.com/shop/shelters-accessories/six-moon-designs-lunar-solo-ultralight-tent-24-oz/
The latter is bang-on what I have seen elsewhere for the weight at 24oz/680g. Does that measure up with yours in the flesh? If so I'd be willing to take a punt on the heavier one.
spj7
I suspect it's more than 100g heavier? as it'll be without poles. Not sure, but maybe. Still a great tent, and unless you are gram counting like me for the divide, another 100g for a more sturdy groundsheet is probably worth it anyway. The groundsheet on mine is very thin, but apparently surprisingly durable. It's also very slippery, so if you pitch on a slope, you slide.