Have used the Inferno for a couple of years, but found every time that I encountered sticky track conditions, coming out of slow and mid speed corners caused it to slip and make a horrible grinding noise and vibration (Black + white spring combo), Tested the Draggin Skin next session, gained 3/10ths. Cost is a factor as the Draggin skin is not cheap, but the shoes are also replaceable. As with a lot of things in Karting it is a matter of preference.