swcycling said:
Im trying to pick out a good HRM/Bike Computer. Im looking for something with All the basics, I want speed distance, time and such. I also want it to do cadence, and heart rate stuff. Finally I want to be able to download it to my computer to look at the graphs and stuff. I dont need power info (but it wouldent hurt) and I am looking in the <$250 range. The two that I have found are the Polar S520 and S720. Have you guys seen anything like this or good places to get one? Any Ideas?
Its just one opinion but I've used the Polar S720i (using now) and the HAC4+
Both are great, and in a nutshell I can tell you that the Polar is a great HRM that is also a bike computer, and the HAC4 is a great bike computer that has HR functions. That's about the easiest way to describe them.
You are right in that you have to buy the HACTRONIC interface to download to a computer, whereas you can use the infrared on the Polar to download to a laptop with IR (most have) or if your desktop has IR. Chances are that you will end up having to by the IR unit for the polar and the cadence sensor as well, but even with those purchases you will still be measurably cheaper than the HAC4.
The HAC4 has a "calculated" power reading, but this reading is purely derived, and in many cases can be wildly innacurate since it does not take into account things like headwind, or incline... It should work fairly well (+/-10%) on something like rollers indoors.
The Polar has the $350 power meter add-on which of course is a BIG expense, but the readings are far more accurate (useful) using the chain tension to calculate power output, and is proven to be +/-5%
One thing that was a BIG sway for me is that the Polar software is head and shoulder superior to the HAC4 equivalent... the charts and graphs are far more useful and more intuitive, and the way it presents the info as schedules on a calendar is easier to deal with than the HAC4 displays... Though the bottom line is that both have a tremendous amount of info...
One thing I like about the HAC is that it is more visually appealing and I like the physical design of it much better, but in the end, the important things won out and I got the Polar... No regrets... I returned the HAC4 with a "Its good but just not AS good" (for me)
Hope this helps!
Feanor