I just put a Fox Coil on my Heckler and TBH it just blows my 2009 HV RP23 out of the water – It's very plush, smooth and has a more linear feel to it! Ok I have no pro pedal, but I do spin very smoothy (albeit slower) up climbs, but the feel of the bike down more than makes up for it.
The problem with RP23 SC bikes is that they get valved LOW for compression & rebound, (they only have to order 1 type of tuned Shock from Fox – to keep the cost down) – these low valved shocks are absolutely useless on a single pivot bike like a Heckler!
Anybody who has a Heckler with a Low valved shock, i feel sorry for you – DON'T suffer, either send it to TFtuned to get re-valved/pushd or better still get a Van R Coil for £189 form MOJO!