I bought this for my daughters 4th birthday an they absolutely loved it! Its great for this age group and the size is perfect for about 3 kids. Also great to fit into a backyard without compromising all of its space and even in larger room in the house. 
The only downfall is that there is a side opening to the bouncy castle and my 2 year old fell off. Luckily wasn't badly hurt but I think its' still dangerous. We ended putting pillows on that side of the bouncy castle and am thinking of sewing that side up. I think one opening is fine. 

Overall I still think its a great value and it looks great too!