I have tried the trials of HDRExpose v2 and Float32 v2 - they are excruciatingly slow on my 3 year-old MacBook Pro Core2Duo. It is painful.
Oloneo and SNS seem to give very pleasing results but are not worth firing up a virtual PC machine on my mac. That is not a criticism of those applications, but a testament to my laziness and the wealth of options for HDR on a mac.
One of the major decisions in the post-processing chain that often gets overlooked, especially when one has a bunch of different tools for the job (I have collected many HDR apps as well) is the decision to use a 32bit workflow or not. This is really important but often not considered a priority. In everyday terms, one question to ask yourself is:
Do I really need the 32bit file to make the image I am trying to make, or can I stay LDR file format the whole way?
Put another way:
Do I need to merge to HDR or can I use exposure blending?
This should really be the starting point because it alleviates a lot of issues regarding image quality and artifacting. Further, things like local contrast enhancement can be done in LDR outside of enfuse, so simply thinking that one needs to use the full HDR workflow to get that "look" is time consuming and probably not necessary. And, once you get a nice blend, you can always run that file through your favorite tone mapper and get an output image that has that local contrast you want, and layer than into the final image in post.
I really liked HDRExpose when it came out and lived with its quirkiness thinking that it would be refined over time - however, the performance of the new version leaves a lot to be desired. The new approach appears to have built on HDRExpress in that there is a lot of automatic processing that takes place to generate the default preset image - I suppose you could make the default "no processing" but the processing that takes place in each step you perform manually is still clunky. I have yet to really put it through its paces, but I get the impression that the toning has improved with halo reduction being an important aspect of this, but I have not tested this yet.