Babyliss Root Boost averagely retails for £30.49 from most electrical/beauty suppliers such as Boots,Comet or Argos.

"The BaByliss Root Boost brings you the top hairdressers best kept secret for creating volume- using micro crimp plates to add texture to the underneath layers giving all the volume of back combing without the frizz!"
To create volume you are advised to section your hair and crimp a small section (about 1 inch) of hair. To do this you hold the hair straight with one hand and with the other hold the root boost and hold it on the hair for 5-7 second as near to the root as you can. TO achieve the best result, repeat this all around your hair and at multiple layers if desired.

To do this all around the hair with 2 tiers, this takes 10-15 minutes. If you wish to follow this with straightening, or straighten before, the whole process could take 30-40 minutes. Which, on an average day, takes up a lot of time. This has resulted in me only having used this 3/4 times in the past 7 months.
The volume that this tool gives will last for 2 days and what makes this better than back combing is your hair isn't left frizzy and it doesn't need 'topping up'

Overall, this is a great tool that will work but it does take time and commitment that many of us don't have. ..