I'm with ya! There was a visible difference with my snakes after we built the rat rack. If I don't produce enough, I purchase from a laboratory breeder who's animals are raised on the same Harland lab mixture that I feed, so my snakes get a constant supply of quality rodents. After about 6-7 mo? of constant intake, (I suck with time frames) IMO they look better than ever. Even with some coming out of winter fasts, or having laid eggs, I'm extremely pleased with their appearance, and the only thing different is that I'm not feeding rats from pet stores that are raised on non-rodent mixes.