I feel like igus has been catching way too much flak lately at their core, they are good bearings, you just have to use them properly.

Classic RMJP polymer bearings http://www.igus.eu/wpck/7188/DryLin__...
Aluminum cased RJUM bearings http://www.igus.eu/wpck/2292/drylin_r...
Wseries rail systems http://www.igus.eu/wpck/1994/drylin_w

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