I really like this product and think that it is a good value for the money.
In general its just a very simple set of starship components scaled to a 25mm scale, all represented by simple, cleanly laid out line-art. As such its very printer friendly and several optional layouts are provided for typical sized staterooms and such.
If you can afford the modest price, and are looking for the ability to lay out some generic deckplans for adventuring, I'd highly recommend it.
If you already have your own set of detailed deckplans, you probably wouldn't need this product.
If you have some generic deckplans without internal details of internal layout and stuff though, this product could be of use to help you fill out some of those spaces.