well i can only say with my previous experience with DLink USB modem, i have the Dlink DWM 152 & ZTE MF627

on signal par wise, my ZTE MF627 always out performs on signal, and much lower in temperature + faster speed too

Dlink is kind of bad chocies in USB modem for sure

just my honest opinion 

The A6 Dlink dwm-156 is plain bad.. without any inteference, on its own, it loses USB connectivity every 30 mins or so.. The stock v1 MR3420 doesnt recognise it either.

Thankfully the A3 still works okay

Anyhow banning Dlink networking products for good

Now using the TPLink MA180.. Looks better with all black, a nicer UI connect manager and definitely compatible with the MR3420

Comparing both their reception, i think MA180 is slightly stronger at 64% without any external antenna while DWM156 comes average 40% for me