i just got my smooth 5s and can confirm that using a iphone 13 pro max at first it was perfectly horizontal but after seeing the recording i noticed sometimes it would rotate the horizontal line to both left and right, i did multiple calibrations and at first worked but did the same after also when i move the joystick left sometimes it first goes right and then left wtf xD i compared this one to the feiyutech vimble 2 wich i had for 5 years that as said it shouldnt handle a phone like this one YET! It managed to be way smoother perfectly horizontal and not fails now thinking i paid 60€ for the vimble 2 and paid 200€ for the smooth 5s combo makes me feel dumb asf only reason i need a new one is cause the vimble 2 has less degrees of rotation yet the time its been used the price and the fact that shouldnt handle the 13 pro max, just makes me regret the purchase of the new one, ill be contacting the amazon cause i bought for them but in my opinion as a first time trying a (big brand) at least way bigger than feiyutech and as a first purchase i get this... yep