Does anyone know if this works with ubuntu 14.04?

No! The "real" TP-WN725N will, but these (thought advertised as a WN725N) are "NOT" the WN725N, but are made by Archer, and they don't work with LINUX, Ubuntu or LINUX Mint. If you get a real TP-WN725N and plug it in, it will work right out of the box!!

What is this for? Why would one need it if their laptop already does wifi?

I'm about 5 years behind this question and the comments :), but I can tell you that I have a 17.5" Acer 1TB laptop that is less than 18 months old, and I called to have my wireless modem replaced by Xfinity because I was only getting download speeds of about 100 - 112 when my service is supposed to deliver 250+ Mbps. But when we checked my cell phone, it showed 300 Mbps from the same router, and the tech said that my wireless card in this laptop cannot accomodate more than the 112 Mbps I've been getting! He said he's seen brand new high-end laptops with wireless cards that can't detect of connect with a 5G network like Xfinity's is. Maybe because of cost and the fact that probably a large % of people don't have service faster that 100 Mbps or so. So I haven't tried one yet, but most are in the $16 - $19 range. The top-rated (4,300 reviews averaging 4+ stars) is about $37, and that gets you 1,600 Mbps!! Hope this helps....

Is this a good option for the Raspberry Pi B+ model?

If you want this to work with a raspberry pi, use this link. https://www.raspberrypi.org/forums/viewtopic.php?f=28&t=62371&sid=8b78a7e30c4190fad8241b2

Will this work with Windows 10?

I have Windows 10 and received a version 1 (V1) adapter from Amazon. The TP-Link driver downloads do not offer a Windows 10 download for V1; however, there is a Windows 10 download for V2 and V3. I tried to install the V2 and V3 driver anyway, and although it installed, I only get 2-5Mbs down and about 4-5Mbs up. Same speeds for what Windows 10 auto detects and installs as Realtek RTL8188EU. I am in an adjacent room to my wireless router, through one wall and about 15 feet away. I have no idea why Amazon would still ship hardware that is not compatible with Windows 10. I’m only out a few bucks, so no big loss other than it being a hassle.

ASIN	B008IFXQFU
Best Sellers Rank	#25 in USB Computer Network Adapters
Brand	TP-Link
Color	Gold
Customer Reviews	4.4 4.4 out of 5 stars (117,186)
Date First Available	June 7, 2012
Department	wireless networking
Is Discontinued By Manufacturer	No
Item Dimensions LxWxH	0.73 x 0.58 x 0.27 inches
Item Weight	0.035 ounces
Item model number	TL-WN725N
Language	English
Manufacturer	TP-Link
Number of Processors	1
Number of USB 2.0 Ports	1
Operating System	Linux
Product Dimensions	0.73 x 0.58 x 0.27 inches
Series	wifi adapter
Wireless Type	802.11b

USB WiFi Adapter for PC(TL-WN725N), N150 Wireless Network Adapter for Desktop - Nano Size WiFi Dongle for Windows 11/10/7/8/8.1/XP/ Mac OS 10.9-10.15 Linux Kernel 2.6.18-4.4.3, 2.4GHz Only

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