@Cowboyflr
Unfortunately, you're going to want to look into a different device that's already been approved/certified. The time it would take to certify a new device is likely going to be longer than you're implementation timeline. We have 900+ MX's in the wild using primarily U620L's & UML290's with Verizon service. There are issues with the connection status in the dashboard reporting 'Ready' when in fact there is not a full cellular signal. Our ticket made it's way into the Meraki 'blackhole', however there has been some progress recently on fixing this.
I certainly respect PhilipDAth's point of view; However, I also understand that depending on the level of need (or SLA) for failover, it just doesn't always make sense in terms of cost and ROI. Our modems were almost entirely refurbished for around $40 a pop. We've had sites running multiple weeks on these while we work with the local carrier to resolve their issues. Reliability is definitely a case-by-case basis though. Certain USB modems can be outfitted with external antennae if the reception is just too poor.
