I've done testing at home with a few devices with different capabilities (1x1 smartphone, 2x2 tablet, 3x3 laptop) with the (slightly older) MR72, with both omni and patch antennas. With omnis, the smartphone lost its connectivity first (in my case maybe around 75 meters), then the tablet as I approached the 100 meter mark, and lastly the laptop when I was probably over 125 meters away and connectivity got sporadic. So yes, I could get 100 meters and still have a usable experience (except with the smartphone) and obviously at lower data rates. It's definitely a "your mileage may vary" type of thing as that support doc describes. If you'll have several users and they'll be out there at 100+ meters, consider the ANT-25. It'll depend a lot on your use case, coverage pattern, client devices and client density, etc. Site survey is best bet, as @PhilipDAth mentioned 30 meter spacing, that may work well, and you'll know for sure with a site survey, even if something basic like using the local status page for some live readings on multiple types of devices. I've seen some deployments ranging even over 100m spacing also work well with omnis and without coverage holes.
