I have had no problems with water or any other harsh environments damaging the probes or the cables on my thermometers. - submerged in boiling water, submerged in mashing grains, frozen into a block of ice, used to monitor the temp in a 350 degree oven...
I use that exact model, bought in July of 2008. It was recommended to me by a fellow member of a forum for that other hobby. Several of us on that forum use that model of thermometer and are very happy with them. The forum member who recommended it lives in Canada and left his thermometer out in his unheated shed all winter where it was exposed to subzero (F) temps for several months with no ill effects.
Price-wise they are 1/3 the cost of a Thermapen and seem to be of comparible value. I have no experience with the models you linked to above Tom, but I am guessing that they are probably not as robust as the Taylor model I am recommending.