Fitbit continued solid device growth for Q2, up 31%, year over year, representing a 5% bump in revenue. From that angle, the company’s long-term turnaround appears to be on track — but things weren’t all cheery this time out. Notably, the company’s stock is down in after-hours trading after it lowered guidance for annual revenue. The company laid much of the blame at the feet of the Versa Lite.