I've just downloaded and tried HDR Efex Pro 2, from NIK Software. They made some really good changes.
1st - it's faster. That's a good thing. 2nd- They simplified the interface and the sliders. That's another really good thing. If you start from the top of the control panel, on the right, and just work your way down, it's pretty simple with good results. I strongly suggest that you give it a try. You can download a trial version here and if you decide to buy it you can save 15% by using the discount code AKESS.