I too used an Emily's Garden for my first crop, and it worked nicely. I did find that I had to refill daily by the time they were ready for flower, so the small reservoir was my only complaint (and the crappy airstone, replace asap for best results).

When I removed 3 males (crop from seed), I addressed the reservoir issue by cutting down a dog's water bowl, the kind you set a two-liter in to add water. I fit it into an unused square and set a bottle of solution in it adding 2L to my capacity. Do this twice (two squares) and you've doubled your reservoir.

Good luck.