Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Nice idea but poorly implemented

I've had one of these for a week of intensive testing. I found that my Nokia charger didn't work with it, in fact I tried three from different Nokia models. The ear piece was comfortable to wear but slipped down my face because of the poor design of the "gel" connection to the device. I also experienced poor battery life. In other words 48 hours stand-by and one and half hours of talk time. Sound quality was excellent but there were a few crackles. It comes with a holder it snaps into but it doesn't stay in place and is always falling out. I'm sure you'd loose it easily.All in all it's a shame they couldn't get the design robust enough for everyday use. I suspect the battery life is because the model is faulty.I bought it to replace the Jabra BT200 I gave to my wife but I've now returned it and will be replacing it with another Jabra.