HTC customized every single aspect of the Android interface with Sense. Likewise, a lot of the features that sit below the home screens were given major tweaking. The main apps like calendar and messaging got the Sense treatment and can be seen through the whole interface. Most of the changes however, are strictly aesthetic and does not affect how the system works. But it does make it look consistent and clean.
On low-end devices however, HTC Sense can hamper performance a bit. It maybe an improvement on stock Android and address the needs of a lot of people, but it demandsprecious resources like fixed memory and the power necessary to run daily. The spare apps were carefully chosen by HTC and all are great inclusions. Even with these enhancements, it still feels easy to understand and to navigate from first use. Store locations that you have been to with images and descriptions using footprints. The widgets are relatively aligned to the apps they sit in front of and even designed to show a consistent look on each home screen that the user puts together. The classic HTC weather and time indicators remain front and centre. In the widgets options, you will see a huge number available including several HTC has made specifically to work with Sense. Various sizes of widgets are available to enable you to squeeze in as many as you need on your homescreen, which is quite practical and visually pleasing.
Tapping on a widget like, for instance, the clock, will open up the full app to access the related features you need. In some areas though, they have decided to replicate the core features like the calendar widget, which works more efficiently than your standard Android functionality. Standard widgets include HTC Hub, which lets you download free apps from HTC and look into the latest information from a variety of sources, and HTC Watch allows you choose from hundreds of mobile movies.
HTC has pulled-off making Android its own and supplied several extra functionality to the smartphone experience. It feels more professional because of reliability and quick overlay compared to what Android does on its own.