"I'd be interested in hearing why others have chosen the H52 and how you like it."
I bought the H52Fw because I wanted to switch to strictly AA batteries, a beam that made better use of its lumens than the pure flood of the older H30w that I continued to use, and a more efficient emitter. The H52Fw has the best combination of features, beam, and tint that I know of for my use, so I put aside my doubts based on past failures due to water ingress and UI faults, and got one. The SC52w I just bought to go with it, but it is a wonderful light.
The floody models are excellent for everything from close use to trail hiking, with a broad beam evenly fading from a wide center, while the regular models without diffusing film give a brighter spot with more reach that is still very large, and maintain very bright spill. I'm fond of saying that the floody models are better if you're looking FOR something, while the undiffused beam is better for looking AT something. Together, I think they make an excellent combination for use in the woods.
These new models are of different construction than the ones that I have had fail. I don't know if they are susceptible to the same problems, and it's quite possible they are not. My trust is not easily regained, however. I won't submerge them, will keep the headlamp under the hood of my rain jacket if hiking in the rain, and hopefully will continue to enjoy them for years to come.