I'm taking lypo spheric Vitamin C since more than 2,5 years, I buy it on the internet cause pharmacies don't sell it over here.
I find it very efficient. I took it every day for almost 2 years, now I take it when I feel it's necessary. For instance: when I feel I'm catching a cold, I take a double or tripple dosis for 3 days, and it doesn't come through.
just a practical advice: try not to stir it (it's not very nice to drink, but not terrible either), that breaks the liposomes.
Don't know what else to say...