Upgrading the linear rails on my CNC

Here is a ‘before and after’ photo of the rails I’m planning to use. I’m not sure if these are the best rails, or if I should have gone for the type with a metal bar and a round linear bearing, which is common on 3d printers at least. I’m not quite happy with the ones I got here, as it seems they won’t cope with the load… They were quite expensive… bought them on AliExpress…

2014-12-16 22.22.24

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