well. to really not feel bad, consider this: there is no way $8 of rollerblade bearings can beat precision made linear components. They may come close for many practical applications. But you have some parts designed for what you want them for: providing movement for a production quality machine. i hope your machine build lives upto the components. they look like they need a very sturdy rail to ride on.
I am about to investigate if their is a potential product idea here. i could sell these things to hobbiests for some reasonable cost. they can make the rail from cheap steel.... hopefully...
dont worry ynneb, you get what you pay for many times - especially with high quality motion components.
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