It is 'all-in-one' software.

It has most of the features I need. Competitors like Nicepage don't have ecommerce for example.

The reliability that comes from a single vendor. You don't need to deal with multiple vendors to achieve the desired result (e.g. Wordpress plugins which must be purchased separately and don't always work well together, or fail on update).

The support forum is great and you can usually find a solution to the major problems.

It is simple to use.

Value for money.

The unique abstract layout blocks on pages - you can arrange the forest before arranging each tree.

It has a long history and is consistent, unlike some vendors who keep changing direction and changing names.

Desktop software, so you do everything on the desktop - instead of the awkward arrangement with Wordpress (templates & content). Desktop software is also quicker to work with and immune to internet issues. WebsiteX5 will fit in with the new 'cloud repatriation' trend.

Static HTML, which loads quicker (better for SEO). It is also more stable and secure than a content management system.

So all in all, it is great for small business owners.