This Kerastase Serum - Worth the price tag?

This https://www.lookfantastic.com/p/kerastase-resistance-therepiste-serum-30ml/11134708?adtype=pla_with_promotion&affil=thggpsad&affil=thggpsad&gad_campaignid=20729587647&gad_source=1&gbraid=0AAAAAD-fXip19n3vQAxYhQ_kGAFakSNDG&gclid=EAIaIQobChMIq_7QsZOZjQMV46JQBh2NHRUqEAQYASABEgIsaPD_BwE&gclsrc=aw.ds&kwds=&product_id=11134708&shippingcountry=GB&shoppingpid=EXTRA15K&switchcurrency=GBP&thg_ppc_campaign=20739597553#reviews www.lookfantastic.com/p/kerastase-resistance-therepiste-serum-30ml/11134708/?affil=thggpsad&switchcurrency=GBP&shippingcountry=GB&shoppingpid=EXTRA15K&affil=thggpsad&kwds=&thg_ppc_campaign=20739597553&adtype=pla_with_promotion&product_id=11134708&gclsrc=aw.ds&gad_source=1&gad_campaignid=20729587647&gbraid=0AAAAAD-fXip19n3vQAxYhQ_kGAFakSNDG&gclid=EAIaIQobChMIq_7QsZOZjQMV46JQBh2NHRUqEAQYASABEgIsaPD_BwE#reviews]]]]

is it worth the price? I have coloured, medium thick hair, quite dry on ends. I’m looking for a decent serum with heat protection, I don’t mind paying that but more, IF it makes a difference. If it does nothing spectacular than say anything else you may pick up on the high street then I may as well just stick to my budget serum!