It works best on very short hair so if this is your first time shaving your head then make sure you trim it first. If you do have well trimmed hair then this thing floats across woth ease.
When you turn it on it displays an estimated run time left which in my eyes is so much better than the battery percentage as I always know how long I need to cut my hair.
It comes with a bunch of different detachable heads including normal trimmers, nose hair trimmers and the really cool massage heads, ones even there to do facial massages if you're really trying to look after your skin.
Overall for the cost and size of it, it really is a nifty bit of kit.