It does what it says it does. It's relatively easy to set up and use. I think it might actually even spin stops earlier than the pokemon go plus (making it good for driving).
The downside is that it's really flimsy. The front cover of mine was dislodged when I got it and needed to be re-clipped (which caused other issues with the band), the band solution it uses is nearly too small for my wrist and it's hokey pulling it in and out with it being as fragile as it is. Definitely will be looking for a different solution some time in the not too distant future when or maybe before it breaks.