I use this tracker since 4 weeks and am very excited. Already the predecessor was already well and finished in 3rd place in the chip test. All "defects" such as poor lighting bracelet closure or missing have now been improved or added in 2.Variante. The connection via app to the iPhone 6 works very well. However, one could make the app a little more extensive. The chest strap is very good and is functioning properly. NOT forget necessarily enter their own stride in the app! Around 130 euros is not exactly cheap, but if you want quality and accuracy is right here. A maximum deviation of 10% has to accept it but.
Unfortunately, there is currently very few providers for other colored bracelets, a provider requires almost 50 euros for 3 bracelets and I find that dr ...... Normal price for 3 bracelets is 24,95 Euro and is okay. Since the Vivofit2 is still very new in the market, it will be sure to get very soon a little cheaper, the prices for more bracelets will certainly fall.
Greeting