Eco-Complete is a fine substrate, many people use it with great success.
ADA Aquasoil is priced about the same and is also regarded as a superb substrate.
Eco-Complete: Pros: grows plants well. Firm. Cons: Sharp for some ground dwelling critters mouths/bodies.
ADA Aquasoil: Pros: grows plants really well. Available in 3 colors. Depending on the type lowers pH softens water. Cons: Softer- can get messy if you go around wildly stirring it up.