Chinese profile rails

[PotatoMill]

Does anyone have experience with chinese profile rails like these http://www.ebay.com/itm/2-x-HSR20CA-2R-1000-mm-Square-Liner-Rail-4-HSR20CA-Blcok-Bearing-/262310537931?hash=item3d12ed2acb:g:a8kAAOSw14xWL5P O ?

Is it worth the savings from not using Hiwin?

[JAZZCNC]

They are Ok but those are not much cheaper than you could buy Hi-win for.

Send Fred Lee at BST automation an email with sizes and he'll give you a good price for Hi-Win. Feel free to Say Dean in Uk recommended him and it may help.
http://www.aliexpress.com/store/group/Linear-Guide/314742_211105973.html