Hair Issues: Update on Brazilian Keratin Simply Straight Treatment

It's been a few weeks since I've had the Brazilian Simply Straight Keratin Hair Treatment which I blogged about earlier. At the beginning, I thought that it made a small difference. My hair seemed softer and slightly more manageable, and the curls seemed a bit more relaxed. But it's only been a few weeks, and the small difference has all but disappeared. I notice absolutely no lasting difference in my hair, and the difference I did see was so minimal. I think, except for the slight relaxing which I might have imagined, the same effect could have been achieved by a deep conditioning treatment. It was definitely NOT worth 4-plus hours and almost $500. So if you're considering this, and your hair is very thick and very curly like mine, think twice. The results fell far short of my expectations.
I've also made another observation recently. It seems that whenever I have my hair colored, it's uncooperative and unmanageable for a week or two afterwards. I colored my hair last week, and it's been frizzy, funky, and impossible to care for since. Hopefully, the hair color hex will soon wear off.