Re-Indoor 27.
Yes i have notice a change in poo smells. Infact yesterday i didn't even know they had pooed till i checked their trays. Usually everyone in the house would know as they would stink the place out. Let's see how it goes long term.

If you are looking to have the best food at the best price I would suggest that you try Orijen. It is around half price compared to RC or Hills and by composition it is by far the best with high protein and no grains. I order direct form Orijen's local dealer in Germany, there are none in Luxembourg, and they deliver to the door for free. For two 7 kg bags I pay 87,5 Euro, you can also get the 20 kg bag for 99 Euro however that does not close proper and with my 4 cats it take to long time to consume it.

What I also would suggest is Bozita wet food that comes in easy to use tetra-pack. The cats love it and it is free from grains made in Sweden at a superb factory with better hygiene then similar facilities for human food.