Mind you, it was a Vapochill Classic Edition, and they are rated for 120W of heat dissapation, in comparison to 140W, 160W & 180W for the SE, PE & XE models. The Prommie MkII is officially rated for 200W of heat dissipation and the Prommie MkI is only 140W from memory. However, most users say that the cooling capacity of both is approximately equal.
You ought to check out this
thread in OCAU. Cathar's water setup against Stergiopolis Vapo PE. I shant say who won, but it was an interesting event to say the least.
The Prommie gets the vote from me anyday cause of their cooling efficiency and plus the mounting mechanism. Unless u're on a P4 platform than the Vapo's evap head aint too much of a worry.