Hi! I've had these for about 3 weeks. I have naturally wavy mid-back length hair. I'm Italian..so my hair is thick, not fine. I was interested in the long rollers because WHAT A GREAT IDEA! They do heat up well & fast! I use them as shown on air & wrap my hair around & around then tuck in the end & wind it to the scalp. They do get tangled sometimes, as with any curler.. They do not burn my head, hot to the hand if you hold the center too long. But edges are cool. I feel as though I'm rambling... I've left them in for 2 minutes & 20minutes. Either anount of time; Curls are bouncy & last.. Without hairspray, my hair is still beach wavy at 10pm from a 7am set. Worth $100? Egh. Worth $20 a month for 5 months? Yep. Keeping them. Hope this ramble helps & I'll answer specific questions if it didn't. Dawn.