had no problems with my Viso. easy to read, easy to use after jump (to get jump info) there is "string" supplied to mount it to the wrist strap however i thought this was a bit sketchy so i used 2 small computer cable ties, chopped the ends off and moved it around till it fit best. not worried about losing it in Freefall. the button combinations required to turn it off take too long for my liking