Am interested to see the results of your testing. Rogers and at&t don't have dual channel hspa on their network. Bell telus and T-Mobile do.
I use this modem on my device because I am on bell with good results.
However, I also use it as there is no lte in my area. If you use this modem you will not have lte as its not in there.
Sent from my SAMSUNG-SGH-I727 using xda premium
Google Nexus 5 by LG 32GB
Stock Rom - Rooted
Google Nexus 10 by Samsung 32GB
Jumping between Stock 4.4.1 and CM 11