The question is, does it live up to all the hype? There are more than 30,000 reviews on Amazon, 70% of these reviews give a 5-star rating, and 14% give a 4-star rating. According to the numbers, the HSI Professional truly is a high-quality product that is well-deserving of the attention it's been given. Buyers love how quickly the HSI Professional heats up, what it does for their hair, and how easy it is to use— even on short hair.
If you are unsure what exactly your hair type is (or if it has changed over the years, which happens more often than you’d think!), check out this incredible overview by the hair professionals at Redken! Don’t stress if you have combination hair (i.e., fine and curly or thin and straight) either; we recommend choosing a hair straightener based on your biggest hair complaint and focusing on that problem first. So, if your curls are driving your nuts, you will want to select a hair straightener with higher temperatures, thin hair needs moisture, etc. You’ll find that your entire hair type can usually benefit from the extra TLC!

Unleash your hair's potential. Thicker, denser hair and stimulated hair growth. Helps stimulates hair growth thanks to the Glucoboost™ molecule which acts as an energy boost to the root of the hair. Specific formulation for colour treated thinning hair. Leaves hair feeling soft and looking beautiful. Reveal up to +1700 more hairs in 3 months* For thicker, denser hair Read More
Smooth, silky hair that shines is possible with no appointment necessary – modern flat irons designed for home use let you style hair like a pro. Straighten, smooth, curl, wave, spiral, flip and bend hair with hair styling tools that give you the power. Express yourself and create new styles or maintain your hair as you wish; hair straighteners with ceramic plates reduce stress on hair and protect hair’s natural luster because they prevent hot spots and naturally emit ions that eliminate static and reduce frizz. Take control of your hair today.
The more temperature control options you have, the more control you'll have over the heat you'll be applying to your hair. Keep in mind, any type of heat styling can be damaging to your strands, so you want to take care not to use too much high heat, especially if you're styling daily. Flat irons that have lower temperature options that start around 250 degrees Fahrenheit are ideal for those with thin, damage-prone hair. If you do have thick hair, higher heat settings can help straighten those curls. To help prevent damage, you should start with lower heat first, and then only increase as needed. Keep in mind, anything above 400 degrees has the potential to damage your hair. Even those with coarse, curly hair should stay within the 350-400 degree range to be safe.
If you are interested in adding the benefits of keratin use into other aspects of your hair care routine, treat yourself to a keratin-rich hair mask once per week! There are dozens of fantastic keratin masks on the market to choose from (and even in your local drugstore!), but we love Naat’s Brazilian Keratin Intensive Hair Mask (which you can buy here from Amazon) for a consistent shine every time!

“Being a mom of two, it’s hard to have time to get my hair done, but with this, I do my hair in 30 minutes, rather than over an hour. I haven’t bought a new straightener in probably four years, and I bought this with very little expectations. OMG! First of all, not only did it take half the time to do my hair, but it left my hair as amazing as I always wanted it! Super silky-smooth. I then used it to make some curls on my 8-year-old. In less than 15 minutes, I was done with her hair and she was in love with the curls.”
BEWARE of sellers with LOW FEEDBACK! Ask sellers questions about the 22 things I have pointed out above. If they do not answer, don't buy! If they make excuses, don't buy! Also, some buyers who have been ripped off are trying to resell their GHD's to cut their losses. Watch for things like "I got it as a gift" or "I recently cut my hair". One of the seller's I purchased from was supposed to be shipping out of Georgia but he really shipped from China. Don't believe everything you read about a seller's information. They can lie.
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