Can you add additional powerline devices to network?

Of course you can but remember the speed its divided in the number of devices conected. your maximin badwith will allways be 500 mbps in the powerline network

How secure this is? I assume it is not just limited to your house's internal circuit. Could it be accessed from outside the internal house circuit?

These systems are hackable, but it takes a lot of work by a good hacker. Here's an excellent treatise on this subject: bentasker dot co dot uk/documentation/security/282-infiltrating-a-network-via-powerline-homeplugav-adapters As this treatise says at the end, TP-Link has released a firmware update to fix this issue, and that new items leaving the factory would not be affected. Users with affected devices can download the firmware update from tp-link dot com/en/.

Has anyone tried this setup with an extra wireless router at the end?

Yes. I have a Linsys N on mine. You have to disable the DHCP on the slave router. Also you need to assign a static IP on the router. Use something like 192.168.1.250. Then only plug into the ports with the line from the wall unit and not into the internet/supply port. If you have a 4 port router with 1 internet port, you have to use one of the ports for the service so you can hook up 3 other direct connects. You then have to rename the wireless on the "slave" router to exactly match any other wireless providing service same with password. You need to make it a duplicate router. Good luck

whats better 10/100/1000 m port or 10/100 m port

10/100/1000 is better, but only really needed for HD streaming on multi devices or gaming. Though the ports split the speed 1000mbs, 2 ports, probably only get 500mbs on each and depending on how many devices. Then the wiring in your house matters. I top at 50mbs per a device. with only one device connected, so getting the 2 port is worthless and getting a 1000 is overated

ASIN	B00AWRUICG
Best Sellers Rank	#3 in Powerline Network Adapters
Brand	TP-Link
Color	White
Customer Reviews	4.2 4.2 out of 5 stars (20,442)
Date First Available	January 21, 2013
Is Discontinued By Manufacturer	No
Item Dimensions LxWxH	2 x 2.6 x 1.1 inches
Item Weight	13.8 ounces
Item model number	TL-PA4010KIT
Language	English
Manufacturer	TP-LINK
Operating System	Windows 10/8.1/8/7/Vista/XP/2000, Mac, Linux
Product Dimensions	2 x 2.6 x 1.1 inches
Series	powerline adapter
Wireless Type	802.11bgn

TP-Link AV600 Powerline Ethernet Adapter Kit - Gigabit Port, Plug Pair &Play, Power Saving, Nano Sized Powerline Network Adapter (TL-PA4010 KIT)

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