Many Atkins products contain the sugar alcohol maltitol, which has a much high glycemic index than other sugar alcohols.
Of the selection on iHerb.com, I have divided the catalogue into those with no, some and a lot of maltitol. I also add my reviews for those that I've tried. [Ed: Some of these might no longer be available on iHerb. A few, I got from Amazon so they might not be on iHerb either]
No maltitol
I haven't tried:
Dark Chocolate Cherry & Nuts Bar
Dark Chocolate Peanut Butter Bars
Dark Chocolate Sea Salt Caramel Bar
Peanut Butter Fudge Crisp
Shakes: vanilla, strawberry, milk chocolate - these taste nice, but are rather thin
Cafe caramel, dark chocolate, - I haven't tried these
Blueberry Greek yogurt
Excellent - like the real thing [Ed: Last I checked iHerb, there was maltitol, but the version that I bought doesn't have maltitol though, but glycerin. The official Atkins website matches the ingredients list of what I bought]
Chocolate Almond Caramel
Okay. A little of the characteristic heavy taste - it seems Atkins chocolate coating is the common factor here, so it might be best to avoid the chocolate-coated products (this was 3 months past best by, but it still wasn't that heavy).
Couldn't taste the caramel. Almond taste was light.
Chocolate chip granola
Excellent - like the real thing
Chocolate mint (protein wafer crisps)
Light and crisp. A little of the characteristic heavy taste.
Chocolate Peanut Butter Bar
Has the characteristic heavy taste but otherwise has some resemblance to what it's supposed to be (but possibly because I had it 4 months past the best by date)
Light & Crispy Lemon Bar
Very good. Crispy, with a good lemon flavour
Vanilla Pecan Crisp Bar
This is pretty good. It has a bit of the slightly off taste that some other bars do but it has a good crispy and grainy texture. I can't really taste the pecan, while the vanilla flavoured coating is okay
White Chocolate Macadamia Nut Bar
This is quite good. It has a convincing crisp and flavour
A bit of maltitol
Caramel chocolate peanut nougat
Alright. Like a lousier Snickers bar
Significant amount of maltitol:
Caramel Chocolate Nut Roll
Caramel Double Chocolate Crunch Bar
Caramel Nut Chew
Chocolate Peanut Butter Pretzel Bar
Nutty Fudge Brownie Bar
Chocolate Caramel Mousse
Okay, like a lousier Mars bar
Chocolate Chip Cookie Dough Bar (a bit less maltitol than the rest)
Weird. A bit chalky.
Chocolate Coconut Bar
Good coconut + chocolate taste
Chocolate Hazelnut Bar
Alright. Like a granola bar.
Cookies n' Creme Bar
Good: Convincing chocolate taste. Crispy with a layer of cream
A LOT of maltitol (it's the top ingredient)
Peanut Butter Cups
Great. Convincing.
Chocolate Candies
Good but when cold they're not so good. But if not cold they may melt.
Chocolate Peanut Candies
Dark Chocolate Almond Coconut Crunch Bar
(these 2 have less maltitol than the first 2 but still a lot - it's one of the top ingredients)