New Tool Review: Mirka DEROS 550X Random Orbital Sander April 23, 2015 By Paul Mayer & filed under Buying Advice, Product Review, Skill Building. Always on the lookout for innovations that make sanders perform more quickly, quietly, and with better dust collection, Paul Mayer found that Mirka scored big in each of these categories with its new DEROS random orbital sander. Read more ยป