We have 110 APs (121 and 330) and had them installed by Lan3 about 2 years ago and are still troubleshooting the problems now.
First problem, lazy ass bloke from Lan3 didn't do a proper survey and just guessed where the AP's should go.
Meraki and Aerohive use the exact same hardware, get some trial AP's and open them up have a look.
Hivemanager and HiveOS are buggy and new releases often get pulled and then re-released within a few days to fix the major bugs.
Roaming doesn't work properly, guest access has lots of issues, AP's auto power setting doesn't work, AP's randomly reboot.
We do have a very complicated Lan design, we route all the traffic from the edge and this normally confuses a lot of engineering and takes them a while to get there head around it.
I suspect this our Lan design hasn't helped with some of the issues but it really isn't anything unique, we have been working with Lan3 and Aerohive to fix most of the issues and things are much better than when it was installed 2 years ago.
If you do use Lan3 you want Steve Coles doing the install, he's knows his stuff.
I advise you test as many manufactures as you can and focus on the wireless capabilities before you get sucked in by all the features. We tested Aerohive, Meraki, Xirrus, Extricom, Aruba and HP, we would have tested Ruckus kit but couldn't get demo equipment.