The Aquila Red low G strings (sold separately, not wound) are the best of both worlds, in my opinion; thinner like metal due to the copper powder added, but durable like nylon / fluerocarbon strings.
The sound also blends in much better with the other strings, much less 'thumpy'.
Like all Reds, they feel a bit paper-like at first, but that goes away quickly when you play them.
I agree. My first red low G that I ever used is still going strong after more than six years and 100s of hours of play. On the other hand two that I used for low A on 6 string broke within two years near the tuner or nut, but I assume that was not due to play wear.