My eldest son (almost 3) started when he was just 9 months and my youngest has joined him and turned 1 a week ago. For the sake of balance, the only criticism I can offer is that my eldest is too keen to go. He often asked to go during the holidays as he misses his friends (children and dogs alike), it can makes his doting mother feel left out ;)
Whilst they are under 2 the children come home with little books telling you about their day, little achievements, new friends, favourite toys etc. Esme's has rabbits and 2 gorgeous dogs that mean my boys get to learn about pets even though I'm allergic.
The childminders genuinely care about my boys and I feel no qualms at all about leaving them here. You get a personal relationship so often lacking with the larger nurseries but also the social benefit of having other children to play with.
We have recommended Esme's to several work colleagues who now use them. We have pick ups at the front door, it could not be easier.