If you did not see an immediate "CONNECTION SPEED" improvement (the speed your router/modem reports) then you will see no "throughput" speed increase. If you do see a marked increase in connection it will take the background systems at least 48 hrs to raise your "profile" as it is this that determines your throughput speed.
Well, I've connected the I-Plate, and I'm really pleased with the initial result.
Using the PCA broadband speed tester, my download is up to around 5Mb (previously averaged 3 - 4). Upstream isn't a great deal better - up from about .28Mb to .33. Neverthless, that's a very cheap way of getting a substantial improvement.
Of course, the above is only a snapshot in time, but I'm delighted.