I used that guard for a week in the Alps. It worked fine for the first three days until the chain jammed in the top guide then it would jam 3/4 times a day after. i couldnt lower the top guide any further without fouling the chainring bolts. Aligned and fitted correctly on a Kona Entourage, after having to grind down the back bolt for clearance. Note the slider plate looks too big if you're using
I bought one of these cages and it hold my bottles securely without rattles, It just works really well so I bought another ( enough said).
I admittedly only use this on my road bike but I would happily use it on my mountain bike