I just recently bought the ASUS PCE-AC55BT to see if I can get really fast internet speeds. I've been running a USB Wireless adapter and I've been getting 2-5 Mb/s download speed on speedtest.net and I just couldn't take the slow internet speed anymore. When I got and installed the ASUS PCE-AC55BT, the first 15 minutes with it was the most satisfying moment of my PC experience. I was getting 25 Mb/s download speed on speedtest.net (I know this is slow but this is the fastest download speed I've ever got) and was able to stream 4k videos on youtube on my 4k monitor. Even steam games were downloading at 3 Mb/s which were the fastest i've ever seen steam download. Then after that my internet just went to downhill and i've been having download speeds similar to that of when I had my USB Wireless Adapter. Sometimes my internet would be even slower than the USB adapter where I can't even use the GTA 5 launcher because the internet is too slow. Right now I don't know whats going on with my adapter and any help would be nice.