The Gmax1000 is very very stiff, though the colmic x5000 was lighter, slimmer and stiffer when I had them up together at fosters.
I didn’t get a gmaxx 1000, or the colmic for that matter. My overall impression of the gmax was it was top heavy with a match kit on, just like the g10. Not quite as bad, but still top heavy. Would have killed my back at 13m, felt as heavy as my older maver distinction (the distinctions’s about 950gm at 13 m). I went with a sensas 774 in the end, as I do little carping anyway and it was light, stiff and felt the nicest with the best range of spares.