I can use it right but it takes too much effort compared to other tools
I would say that the Tyme iron is good, you have to learn the method of using it just as an other hairstyling iron but as long at you think logical, is aware about the holding position, follow the guiding videos and etc. then it's completely fine.
I completede af total curling of my hair on the first time using it, with small mistakes a long the way but mistakes that could be done right afterwards.
It does feels nicer to run the Tyme iron through your hair than the normal clamp curling iron i already have, but my absolute favorite curler is the Babyliss Curl Secret.
With the curls I have made with the Tyme iron, I haven't experienced that the curls hold that long, sadly. - I know it varies depending on your hair type though.
It is harder, than I expected, to figure out and manage the techniques for the different curl variations.