DPreview mentions a few good things about it in their March, 2016 shooting experience, They mention that Canon in the 80D has updated the Auto ISO feature, as they say "a la Nikon and Sony,", allowing users to more fully program how the Auto ISO is actually configured, so that's a real positive.
And the sensor is better than older-tech Canon APS-C, AS THEY WROTE, " it is interesting to note that the 80D uses a newer sensor that we've found offers
much better dynamic range than previous Canon cameras, including the 7D II.". WHat sounded potentially worrisome was this: " do have few small frustrations though: the AF-on button is located next to two other identically-sized buttons and is the most difficult, at least for me, to hit of the three. I also find the switch to lock the back control wheel, which by default is set to Exposure Compensation, can be bumped into the lock position far too easily. In fact, every single time I went to adjust my Exposure Comp., it was locked."
Offsetting that--700 stills, 35 videos of apprx. 30 seconds each, and only used 1/4 of a battery!
45 AF points--all of them cross-type? Thjat sounds like a good specification, buuuuuuut....read the section on subject tracking, which seems to be poor on most subjects: "..the 80D isn't great at staying on a subject once it has been identified. This is partly due to the fact that being a DSLR, the 80D cannot not use its image sensor to track (except in Live View mode of course)"--and yet another caveat: the 80-D's "....has the potential to work well for subjects on non-complex backgrounds, and particularly subjects well isolated in depth (distance) at longer focal lengths."---so, maybe it'd be good on birds in flight situations? According to what the author writes, subject tracking is not that good when using the viewfinder--but it is pretty good when Live View is the method used to frame images and follow action.
It's tricky to go by written stuff from an author you're not 100% familiar with; the 80D has very good low-light AF capability, and he said he could acquire and lock focus using the through-the-fionder method, in poor light with a pokey lens, the EF-S 18-135 f/3.5~5.6, at very low,low indoor light levels, where ISO 16,000 at f/3.5 at 1/30 was the correct exposure at the wide-angle end of that kit lens.
Taking it easy: Canon EOS 80D shooting experience
I dunno....this sounds like a VERY good performing, modestly-priced camera for enthusiasts, but it's not really clear how well it would work for tracking AF using the viewfinder; sounds like the lack of the Intelligent Tracking and Recognition that the 7D Mark II has is the biggest missing feature according to the dPreview reviewer in the shooting experience test--which is NOT a full review.