It is worth it if you plan to wear your hair curly every single day, not straighten it, and not wear it in a looser pattern (if that's possible for your hair). It was worth it for me at first to fix a really bad hair cut. But then after my 2nd cut, I realized how uneven my hair was, and I had to refresh every morning or else my hair looked like a 2 year old took scissors to it. Mine was this uneven, because my curlist (and longest) hair was in front, and my waves are in back and on the back sides so it was cut much shorter than the front and the sides. So I guess it just depends on your curl pattern and how you wear your hair everyday. I personally wear it curly on first day hair, then tend to wear it wavy on 2nd, 3rd, etc. Much less maintenance and work for me after getting rid of my Deva cut.
2c-3a - med-coarse - normal-high porosity - high density

NP/LP: CJ Daily Fix, KMF Whenever / Giovanni TTTT
RO/LI: Aussie Moist, CJ Argan & Olive Oil, Hask Keratin Protein
DC/PROTEIN: KC Stellar Strands / CNPF
STYLER: CJ Curl Queen
COLOR: henna, amla & indigo
: glycerin in high/low dews, polyquat-10 & 11, parabens