No he tenido ningún problema técnico y son muy cómodos. Top half of case does not fit. i want to have a toe box that i can wiggle my toes in again and some bounce and traction in shoe I dont really care for lights on the headset, its nice and all, but really not necessary IMHO, as I dont like these additional bells and whistles that suck battery life. frustrating. Ive been using this cover for the past 3 months, at first I would have given it a 5-star review, but through constant use, I have found a few flaws that are starting to bother me and Im considering on buying a new one. gone. if the battery life is as advertised i will be happy, but not needing batteries makes up for that easily. I do love that the charging/storage box is small. 1 year update: After a year it is still my favorite mouse and I have acquired many more mice since then.