experience with 2.4Mhz heartbeat bike compu's?? / Cateye V3 - VDO Z3 - Polar CS600 , TIA

[aloha]

experience with 2.4Mhz heartbeat bike compu's?? / Cateye V3 - VDO Z3 -
Polar CS600 ($$$)

TIA

Hi

cateye is cheap / VDO has better specs / Polar is set in diamonds
2.4MHz does this work a promised?

Cateye V3 says distance 50cm for heartbeat
VDO mentions 90cm
Big difference (Cateye also is tiny, while VDO is quite big)
Polar has bad reviews on their Power module, and has a load of
Software Programs I prob wont use

I read 1 review about Cateye: 'satisfactory, drops the beat rarely'
whatever that means

would the VDO be an improvement on that
I think Polar is too $$

I JUST WANT HEARTBEAT RATINGS THAT WORK ALL THE TIME

thanks
MT
netherlands