I got my Irony and just played it stock for sometime but it felt like it would improve with a different bearing, so i swapped it with a 10ball. BOOM smoooth , we all know werrd yoyos (some) have a small vibe but this Irony is SMMMOOOOOOTTTHHHHHEEEERRRR than butter on a teflon pan above glass. Well i just wanna hear others opinion,to me it felt lighter and faster with a flat bearing .