Shuttles play a very important roll in Star Trek. In their simplest form they shuttle gear and personal that could not be teleported for some reason, but over time the need for a warp capable small vessel would become important both from a Star Fleet point of view but also a story one.
From the story side it allowed a different kind of story. Often these were either separating crew from the support of the ship or smaller stories that could be focused on a couple of the characters rather than an ensemble.
Next Gen used Shuttles in their stories effectively, but it was DS9 that made them a central part of the shows ship lineup.
The Danube Class (Nicknamed Runabout) was 23.1 meters long and had a crew between 2 and 4 depending on the mission requirement. They were modular in its cargo area which allowed for several different missions to be outfitted. These included defense (Phasers and Microtorpedo) scientific, medical, cargo or personal transport. The Danube is larger than standard shuttles and this gave it some more versatility. They were capable of landing on planets and leaving the atmosphere. They were able to reach Warp 5 and with that had a decent range. DS9 started with 3 and all of them were named after Earth Rivers.
The Diecast model is quite nice. It does come with a lot of detail and Eaglemoss always does a pretty good job of hiding seamlines and screws. Something that can be a bane to some diecast lines. This model is not perfect, however its not very expensive and if one considers the price they are then these are pretty decent value for money. If you like the Runabout then this would not be a bad purchase.