They still behave as good as new. Its not a smart trainer, but Ive found you can somewhat replicate the changes in resistance with grade by shifting up or down. Of course this is subjective according to who is listening but from my personal opinion, these are GREAT! The shoes are not comfortable, they feel hard, I dont think I can use them for exercise. A great way to store your shoes in an open space I?d recommend it to anyone and who couldn?t use it? We all have multiple pairs of shoes. fix as I have already paired my buds so I just have to click the bluetooth button on Windows 10 again. The shoes are a little too wide for my daughter so I wouldn?t recommend for littles with slimmer feet but they are adorable! Picked up a set of these for late night TV viewing. So what happens is, lets say Im listening to a podcast. 5 lb carbon fiber mountain bike.