Best synonym for "keep" in this context

Question

I want to describe a new product which is an improved version of an existing one. The new product has all the features from the existing product, and adds a few new features.

I am looking for a nice way to phrase the above, specifically the verb which is used to say that the new products has all the features from the previous one:

• Product X keeps all the features from product Y, and adds ...
• Product X retains all the features from product Y, and adds ...
• Product X maintains all the features from product Y, and adds ...
• ... other?

Answer 1

I would suggest that the problem you have in with your choice of 'keeps' in the first place.

When a product is updated, usually a lot of the features are actually discarded, not kept. This is because at the time they were cutting edge, but now they are old.

As the new product can be considered a descendent of the old product, I would try something like:

The new product inherits all the features of product X that you love, and increases functionality with ...