Well if it only has 2.5GB music storage I would probably want to format my music files to the smaller file size of 128Kbps to fit more files on there since most .mp3s-.mp4s nowadays are least 256-320 Kbps.
I have been wearing the Fitbit Versa since its release. The main reason I don't wear the apple watch anymore is that the battery life is very bad. With the Versa I can track sleep, heart rate, Exercise and activity. Built-in GPS? is that really important to most of the population? I don't think so! because who does not carry their phone around with them? Most people practically live and breath with their phones so assisted GPS is not really a con.
If you need a smartwatch that doesn't die after just one day of use, buy the Fitbit Versa. If you need a stellar fitness tracker, buy the Versa. If you need a powerful smartwatch, you'll want to pass on this one.