I've used this with my ceramics & have found it to assist in straightening my hair! However, the sizzle it makes when initially meeting my straightening irons is rather alarming! I didn't feel it 'held' my hair much straighter for longer in very humid conditions (but what does?!). Don't use too much or you will end up with crispy feeling hair that goes lank the next day. However it does provide protection whilst straightening, and is a good, professional product to use.
Have tried many over the years but have been very impressed with this and just about to order my 2nd bottle. I have quite thick, highlighted hair which needs straightening everyday but I find this product really helps keep my hair smooth and doesn't weigh it down like lots of others. Not a bad price either.