I have had 2 pairs of Lowa renegades, and I find them incredibly comfortable. I replaced the first pair when they started leaking, but that was after about 2 and a half years. The second pair didn't do quite so well, so I replaced them with some scarpas, and just kept the Lowas for local walks and the beach, but actually I still think they are my favourite boots, I just have to put up with damp feet sometimes. I still find I go to them for preference.
I read somewhere that a pair of boots will usually last 1000 miles waterproof and another 500-700 miles before they fall to bits. My second pair of Lowas didn't quite make the 1000 miles waterproof, but both pairs managed the 1700 before falling to bits fairly comfortably. I'll probably get another pair next time I'm looking for boots and put up with the lack of longevity.