Genetics have failed me
Join Date: Jun 2007
Location: Zorneding, Germany
Bikes: Norwid Aaland, Dahon mju, Pedalforce CX1, Trek Madone 5.9, Old MTB and lots of spare parts
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The 305 is definitely enough if you just want to map your rides, cadence, speed, heart rate, elevation and a few other things.
The 705 with the ANT+ protocol is very nice, when you want to combine it with a ANT+ powermeter like from Quarq, SRM or Powertap.
I also bought my 305 at geomangear and haven't had any problem with the hardware after about 2000 miles of riding.