I have a taiwanese copy of a 'brand' bandsaw and am fairly happy with it but felt the guide system on it needed updating as it used the wear block system. i felt these were not accurate enough for me when ripping lams etc., so invested $ 100 in a roller guide system. The first cut told me I went the right way . However doubt has now raised its ugly head as a fellow bow maker told me he was considering going back to wear blocks as the roller system on his was forever chewing out the bearings due to fine dust specially bamboo dust, infiltrating the rollers.After spending that money I did, I sure hope there is a better way of getting around this. any ideas especially from guys using the roller guides[ and that must be a lot]