Others have mentioned the differences in altimetry functions -- for me this was the dealbreaker, because I wanted the HAC4s reliable altimeter for skiing, hiking, trail running, snowshoeing etc.
The Polar effectively has _no_ altimetry functions. It will display current altitude, but doesn't have features to track total loss/gain, etc. In other words, it is little better than looking at a topo and being able to say "OK, right now I am at elevation X".
I am really impressed with the HAC4's altimeter, and it's very easy to correct for variations in barometric pressure with the software.
It is true that the HAC software is not particularly user friendly (I prefer the "Hactronic" application for its simplicity), and the english manual is beyond the pale. Fortunately, I read German, so I don't need to torture myself with that wretched document (that translator should be barred from the business for life!!!).
As for interference with the HAC4, I live and ride in a rural area and have never had even one instance of interference.
As for cost, get the HAC4 on Ebay -- you can get the "titanium" model for around $220 and the "Plus" (with cadence sensor, interface and full software bundle) for around $300.
The Polar effectively has _no_ altimetry functions. It will display current altitude, but doesn't have features to track total loss/gain, etc. In other words, it is little better than looking at a topo and being able to say "OK, right now I am at elevation X".
I am really impressed with the HAC4's altimeter, and it's very easy to correct for variations in barometric pressure with the software.
It is true that the HAC software is not particularly user friendly (I prefer the "Hactronic" application for its simplicity), and the english manual is beyond the pale. Fortunately, I read German, so I don't need to torture myself with that wretched document (that translator should be barred from the business for life!!!).
As for interference with the HAC4, I live and ride in a rural area and have never had even one instance of interference.
As for cost, get the HAC4 on Ebay -- you can get the "titanium" model for around $220 and the "Plus" (with cadence sensor, interface and full software bundle) for around $300.