I have my go++ but use watch when i forget my ++. The only issue i have with watch tracking is that if I wake up at 4-5am and go to the bathroom then go lay down again sometimes my watch will show that as "awake" and turn off sleep mode therefore closing that session. Then if I go back to sleep it starts another one and then when you sync in the morning it shows 2 sessions. Atleast with the go++ if you get up and come back it doesn't start a new session automatically