The MSR Windpro is quiet (unless you bodge it to run on petrol, as I did once).  The Gravity has more sharp bits.  glenngeorge, I doubt that the Stella replaces the Gravity - it's from a different company.  The Stella is exceedingly cute, though.  My EpiGas Alpine is still going strong after 16 years, and I believe a second hand one is always worth looking out for.  Better than the newer Alpine from Coleman, which doesn't have a visible preheater.

A very kind soul has found a good bargain price for a Windpro and put it onto the Bargains Thread now.