Super Power Supply® AC / DC Laptop Adapter Charger Cord Replacement for Lenovo Ideapad G580 59359079 ; N585 751027u ; N586 59359207 7540xf1 754084u ; P500 59345704 59347559 ; P580 308725u ; P585 4575h4u ; S400 59359130 ; Y500 59359554 ; Z575 12992du ; Z580 215126u ; Z585 261729u 59345307 90 Watt Netbook Notebook Battery Plug

I got the Super Power Supply® AC / DC Laptop Adapter Charger Cord Replacement for Lenovo Ideapad G580 59359079 ; N585 751027u ; N586 59359207 7540xf1 754084u ; P500 59345704 59347559 ; P580 308725u ; P585 4575h4u ; S400 59359130 ; Y500 59359554 ; Z575 12992du ; Z580 215126u ; Z585 261729u 59345307 90 Watt Netbook Notebook Battery Plug to use as a second charger for my Lenovo Ideapad Z570.
I have been using this with my Lenovo Ideapad Z570 for a couple of weeks now and it seems to work as well as the charger that came with my laptop.  Here are the things that I have noticed about it.
The wall plug fits well.  It is not loose so it stays plugged in even if the cord gets pulled a little.  It is a 3 prong plug.  The plug into the computer is also nice and snug so it stays in place.
The cords seem thick enough. There are two pieces, the one from the wall to the box and then the box to the computer.
The power box thing (sorry I am not technical) does not get hot when plugged in for a while.
It is 8 feet long.  It is about a foot shorter than the one that came with my computer.
I will update the review if it starts to fail on my but for now I recommend this off brand charger.  I use it as a second charger.  I keep this one in my laptop bag so I have it at work with me and that way I can leave the other at home ready to go.  I received this product at a discount in exchange for an honest and unbiased review.
You can find it here:  http://www.amazon.com/Super-Power-Supply%C2%AE-Replacement-59359079/dp/B00NC4JDUO