In acting timing is everthing, in trail shoes, fit is everything. The 872 is a great trail shoe--but only if it fits your type of foot. In the past I've made the mistake of buying Montrail shoes due to favorable recommendations on this site and elsewhere. Well, Montrail shoes don't work for my type of foot, so they are a waste of money for me. Will Rietveld loves the 872 (search for his review on this site), and he is a very knowlegable individual, but the the 872 will only work for you if you have the same kind of feet he does.
What are the anatomical features of your foot: wide toe area, narrow heel, one foot larger or wider than the other, bunions or other bumps, flat arch, high arch, over pronate, under pronate. If you have fairly normal feet you won't have to worry so much about this stuff, but who has normal feet--I wish I did! My right foot is one full size larger and than my left, both feet are wide in the toe box area, and I tend to be a moderate over pronator (land on outside heels.) Saucony shoes for moderate over pronators (sometimes called support type shoes) work best for me, but may not be the best for you.
In conclusion, do research on the internet (Zappos.com, Eastbay.com), measure both feet at the shoe store with the Brannock device, find out what kind of feet you have. It seems to me that the 872 is designed for normal feet, so if that is what you have, you are good to go, if not, look elsewhere.
I should have been a podiatrist, I really get into this stuff!