As advertised, not a great value for money though.

So hard to find! Wonderful supplier!

I started using this sugar years ago and I LOVE it!! I appreciate the fact that I could get it in 1 4-lb. Container from Amazon. The container is so convenient and it is really a good quality sugar.

This sugar dissolves like a dream in all applications. I use for everyday and everything .

What I like: I've bought 48 pounds over the past two years, and I've never had clumping that didn't respond to shaking the box before using it. Just a few shakes and the sugar pours out like silk. Other brands I've bought locally apparently have shipping/storing problems that caused nearly unbreakable clumps. Whatever clumps I've had with this brand respond to a tap with a spoon. I like the packaging: I never have more than 4lbs open, and it's stored in a water-resistant box rather than a paper bag.
Things to know:
Ultra-fine sugar is also known as "Caster" sugar, "Baker's" sugar, "Baker's special" sugar, or (cocktail)"Bar" sugar. It is no different than table sugar except that it is produced in a much finer grain.
I'm not a baker, so I'm not using this in large amounts. I use it in anything where I need the sugar to dissolve quickly and completely, as in iced coffee. (It's often known as "bar sugar" because the ultra-fine grains dissolve in cold cocktails.) This Ultra-Fine is what I always have in the sugar bowl since it can be stirred easily into anything. I've become spoiled on having it available and now use it whenever a recipe requires less than a cup of sugar and only a short handling time. Muffins, for instance.
It measures approximately the same as table sugar when you're using it in small quantities. However, because the grain is so fine, more of this baker's sugar can settle into a container than table sugar can. When using large amounts in a recipe it's better to measure by weight instead of volume, but for most of us, that's impractical. Elsewhere among these reviews, user Dinubabear suggests removing one tablespoon full of this Ultra-Fine from each cup in a recipe when you are replacing table sugar.
The price for this product changes, so I buy ahead of need. I paid $2.19 per pound with this last purchase of three 4lb boxes at $26.30, free shipping. I buy when the price is between $24 to $28 with free shipping.
UPDATE: Forgot I was expecting delivery and this got left out in the package shelter overnight in the rain. When a visitor brought it in, the box got wet during trip from car to front door. It was wet in the kitchen for a few hours before I opened it ... and it was fine. Some small clumps turned back into silk when pressed with a spoon. I hope it performs as well for you.