I have ultra super fine hair..and a lot of it. I have tried every single volume product in the world. long story short..some of them work for awhile, none of them work all day. I mostly use them for when I am going out..because if I use it in the morning by the end of the day my hair looks filthy and weighed down.
big sexy hair has a root pump spray foam, it works pretty well. It gets good height but is the worst for making my hair look dirty after awhile..its best for nights out.
redken guts doesn't work as well, but I rarely have it weigh my hair down, better for all day.
I have a got 2b thickening hair spray that actually is pretty impressive..its made to go in dry, already styled hair but really does volumize the hair right away..only problem is, because it goes in dry hair and has a spray nozzle..it thickens in patches..and it takes a lot of messing around to get it to give an overall plumped up look..and it looks dirty fast, too.
Personally, in general I have a spray gel meant for fine hair that I spritz in my hair when wet, blow dry upside down, then I backcomb the crown of my hair with hair spray then a spritz or two of the thickening spray and a hand fluff. That usually gets me good volume and clean looking hair for several hours.
I have tried the powder, my mom has it..but it is hard to place strategically, gets everywhere and makes your hair feel weird and sticky..and I personally didn't see THAT much height..