I'm looking to buy some frame sliders for my 2001 F4i and I noticed I can either pay around $50 and get Intuitive or pay $22 and get some Delrin no-name Frame Sliders off ebay. I figure since this is going to be a "wear" product it might be better to buy cheaper...if I'm going to buy more than once. But I don't want to sacrifice quality either. So is there a reason I should go for the $50 pair over the $22 pair?