Speeds are determined by how close you are to the nearest cellular tower. On average we have seen speeds between 20 mbps to 60 mbps. The fastest we have seen on our service has been 140 mbps.
Here is a quick guide based on distance to the tower. (Note this is just an estimate. Many factors can reduce speeds.)
0-1 miles: over 50+ mbps
1-2 miles: between 30 and 50 mbps
2-4 miles: between 20 and 30 mbps
4+ miles: between 1 and 20 mbps