Installed two of these in my home to replace older water guzzling ones.  They look great, installed easy, and work great.  I was worried about flushing power, but I have had no problems clearing waste.  Honestly, I barely ever use the 1.6G flush.  The 1.1L does the job 99% of the time.  
Best part is they qualify for $100 rebate from So Cal water!  
I love the comfort height.  I installed in our master bath and makes it easier for midnight runs.