The HP Pro has an SSD storage medium which is better than most portable PCs that are a similar age to it. Most portable PCs of this age and type have an HDD storage medium. Solid State Drives (SSD) store data in semiconductors on a circuit board rather than using magnetic or optical media. Solid State Drives have no moving parts which makes them very fast and reliable.
An SSD storage medium is actually the best storage medium amongst all medium processor core notebook PCs that have been on the market for a comparable time to the Pro.
The worst storage medium amongst similar types of laptop is HDD.
There are a number of other laptops that have an SSD storage media currently available that you might also want to look at including cheaper laptops such as the XPS 13, the XPS 13 (£792.00), or the XPS 13 all from DELL.