Update: I believe they have changed the proportions of erythritol, stevia, and monk fruit in this product. It used to be my favorite keto sweetener, so I'm sad to report that it now gives the cooling effect and is slightly less sweet (more erythritol, less monk fruit?). It's far too expensive to taste just like erythritol. I no longer recommend it and am on the hunt for a new sugar substitute.
Previous review: I have been a keto eater for over a year and, aside from flour, sugar has been the most difficult thing to replace. This stuff, though, is as close as you'll come to the real thing. I don't get the cooling effect like I do from erythritol, the bitterness of stevia, or the measuring nightmare of monk fruit by itself. It also measures pretty closely to actual sugar when baking.
I've read a lot of negative comments about the bag, but I don't see what the big deal is. MOST similar products come in a zip lock type bag (Swerve, etc.). I personally have a giant mason-type jar that holds about half the bag. I reseal it and store the other half in the pantry until I'm ready for it. I have never had any problems with it getting hard; I also haven't had any problems with the seal on the bag. If you have a problem resealing it though, put the whole thing in a gallon size ziplock ... just like you would any other product that comes in these types of bags.
As for the pour spout I keep reading about, look at this products' competitors - they don't have a pour spout either and I don't see people crying about it in the reviews. What gives? With a 5 lb bag, it's not like you're pouring the product into a teaspoon with your morning coffee. Put it in a container and use it like you would a bag of sugar for heaven's sake.
If the lack of a pour spout is the biggest problem people are having, I'd say that speaks pretty well for the actual product the bags contain.