I am looking at purchasing 2 of the firebox M370's. When will they be end of life?
Normally a firewall will not go EoL until at least 3 years after the date of last sale.
M370 units are actively being sold, and are the recommended replacement units for earlier M series units which are on the EoL list.
End of Life Policyhttps://www.watchguard.com/wgrd-resource-center/end-of-life-policy