Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Almost perfect

The 305 is great. The freedom this device gives the runner/rider is awesome. I would prefer to give it 4 1/2 stars, though. It is pretty bulky but I can deal with that. I did not like that you have to run it till its dead before charging it again.Despite these qualms, the 305 is well worth the month and I would definitely buy it again if need be and recommend it for any running/cycling enthusiast.Sidenote: I have yet to try the heart rate moniter.