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Pro Fits well on virtually any wrist
The Microsoft Band 2 comes in 3 sizes to ensure it fits: Small (145-165mm or 5.7-6.5"), Medium (160-190mm or 6.3-7.5"), or Large (185-215mm or 7.3-8.5").
Pro Natural feeling display
The display is slightly curved, making it more natural to wear and use. You also won't be hitting it off walls and doors as often as other watches because it doesn't stick out as far from your wrist as other fitness trackers.
The OLED display doesn't light up black pixels, meaning the background blends in perfectly with the bezels making for a more pleasing look as well as saving battery life when displaying mostly black colors.
Pro Smartphone connected
The Microsoft Band 2 connects to your Android, Windows Phone, or iPhone to provide notifications on your wrist. Swiping left from the main screen shows notifications that have been synced from the watch. It doesn't show context for these notifications however - just the number of missed notifications and their respective icons.
Con Poor battery life
Without using the GPS, battery life can be stretched to a day and a half, but if you do use the GPS that time will be reduced to just a day. Either way, you will want to charge it every night.
Con Bulky clasp
Under the clasp is a sensor that determines whether it's being worn or not (so it can save power when not in use), which adds bulk.