Then, along comes the EOS M5 and M6. I was reluctant to take the plunge due to slow-focusing issues I'd read about. I wanted the smallest possible camera but very high quality. Then, I read that the M6 has a nearly identical APS-C sensor to the new 80D - which has even better dynamic range than my 7D Mii. Then, I thought "but it doesn't have a viewfinder." Well, heck, I take photos all the time with my phone. So, I ordered the M6 with the 15-45 kit lens. I took many test photos. The camera is very easy to work with and I was pleased with the results. Compared to my previous Canon glass, M-lenses are tiny, but they're sharp. Plus, any small faults can be corrected in software. I don't really miss the viewfinder but there is one available to attach to the hot shoe. The controls are intuitive and the touchscreen is a joy to use. Manual exposure is easy to dial in quickly.
Tech support and documentation: One of the big distinctions between paid and free software is the level of documentation and tech support; paid software has more-explicit and -detailed documentation and guides than the free versions. That said, many software packages post instructional videos of the most popular features to YouTube, and more-complex free packages may offer extensive documentation.
Finally, you'll want to pay attention to sharing capabilities. In the past, you only needed to worry about saving your videos to a DVD or a highly compressed video file, but the rise of Vimeo and YouTube has resulted in new sharing options. If you're looking to share your videos to your social network, make sure that your software is capable of doing so.
Shooting movies is also great now with the servo AF feature. My T3i required that I manually focused while shooting movies. With the servo AF, the camera will actually follow the moving subject adjusting the focus on the fly. I mean, your cell phone can do it and so could my point-and-shoot Canon camera, but their old DSLRs actually didn't have that feature, but now (well, since like the T5i I think) they do and it's very useful. Speaking of movie mode, I very much like that they added another step in the power switch for movie mode instead of requiring you to turn the knob all the way to the very end to get to movie mode. Now you simply flip the switch to it.
The next advantage is something I already touched on earlier. The size and bulk. These prosumer line cameras are typically much smaller and lighter than their pro-grade cousins. However, I am now completely spoiled by USM lenses (specifically their new nano-USM system), and they are unfortunately bulkier than the "kit lenses" that typically come with these cameras. But overall even with the bulkier lenses, it'll still be much easier to move around with the T7i than with a 5D or a 1D...
The T#i line is what they call a "pro-sumer" line, which is basically between a consumer line camera like a very basic DSLR and a professional DSLR camera, thus the term "pro-sumer." Typically what this meant is an DSLR with an APS-C sized sensor, decent resolution, and some hand-me-down professional features of pro-grade cameras from a few years ago. For this reason, sometimes it's not worth upgrading from one of these cameras to the next until at least a few generations have past (meaning if you have a T5i, it's not really a giant leap forward to upgrade to a T6i). However, the T7i is somewhat different. When I was doing research on what features it has and what it is missing compared to the pro-grade DSLRs that are considered "current" right now, I was surprised to find very little. The main differences really is that the pro-grade cameras have the LCD display on the top that would display all of your relevant camera settings, and then a few of them would also sport a full-frame sensor. Other than that, the differences are very minor. Something like maybe 1 or 2 frames less in burst mode or something like that. Nothing that would really jump out at you and make you regret not stepping up to the professional grade equivalent (Think it would be the 77D?). It actually has pretty much all of the big features of even their current pro-grade DSLRs, making the T7i probably one of the best prosumer DSLRs to buy.