The ROI is there because the solution works. If you're going to invest in Meraki, you want to keep it at least five years so you get the value back.

The ROI comes from when we switch out phone systems. If you had an AT&T phone system, but switched out to your own Meraki gear and phones, then you would see a giant bill reduction getting off that AT&T contract. This includes your ISP and phones because you don't know what is hidden in that contract. 

Anytime you are working on a very large, physically-wide network, like statewide or countywide, you want it for bandwidth data, unless you have unlimited bandwidth. 

We have seen a return on investment with Meraki MX.

I have definitely seen an ROI with this solution, it makes changes much quicker. Creating a site-to-site VPN with a Cisco ASA Firewall would take me one to two hours, but it takes me about two minutes with a Meraki MX appliance. 

Depending on the purpose of the solution for the user, it might be worth the money. If a user wants to use extra hardware equipment at its full potential or full features on a long-term basis, Meraki MX is a good choice. If you don't want to have a complex tool with features, workload, and so on, Meraki MX can come across as an expensive solution.

With many locations you will save a lot on traveling and deployment, as you don't need this any more. The costs inc. support is comparable with other vendors.

ROI is huge on Meraki products for admins. The learning curve reduces the amount of training required and the dashboard makes administration of MX appliances simple and that impacts ROI in a big way.

Not measured.

It saves time on spinning up new offices, and on managing the firewall.