Thinking of replacing my 2006 coil equipped S-Works Enduro frame with that of a sparkling new green Heckler with a Float r shock.
Only the change from coil to air concerns me really...
I have had three Hecklers now and have loved them all - I now have the 2009 model and it does everything! If it's the coil to air thing that worries you, then put a coil on it - the Heckler can deal with it NO issues!
I still have the RP23 on mine and have considered changing to a coil shock, but every time I ride it I find myself asking the question, why change it if it ain't broke?
However, the want to change from 140mm forks to 150mm/160mm is the struggle I am having!!
I love mine. It's green too (from when there were about 7 or 8 colours to choose from). Got the float R shock which suits me fine, 140mm Pikes on the front.
Personally I'd buy a lockout shock for the Heckler.

