The Flex 15 has an HDD storage medium which is better than the SSD storage medium found on most notebook PCs of a similar type and age to it. HDD is a traditional storage drive which stores the information on magnetic disks. HDD drives are slower than other forms of storage such as solid state drives (SSD) and flash drives.
An HDD storage medium is in fact the worst storage medium amongst all notebook PCs of this spec and age.
Amongst similar types of notebook PC the best storage medium is SSD.
Alternative laptops that have an HDD storage media currently available which you might also want to look at include cheaper portable PCs such as the Flex 15, or the Yoga both from Lenovo.
If the storage medium of this 2 in 1 laptop is too bad for you then you might also want to consider the Toshiba Satellite U920t (SSD and cheaper), or the Fujitsu Stylistic Q702 (SSD and cheaper).