It does lack the mechanical blasting action of regular showers, which is good for removing caked mud. But that doesn't come up often in my life. I found it more pleasant and just as fast for normal feel-good, smell-good showering purposes.
I personally like the idea of recycling water better. Which potentially gives you even temperature, better pressure and water savings.
http://www.amazon.com/Watersaving-Experience-7-setting-Hands...
Hmm, I need that, just due to playing with (and having) kids and doing yard work. I could imagine redoing a bathroom and having a shower large enough for a traditional shower head on one side, and this on the other.