Speculation about Gilt Groupe offerings

i think the last gilt sale had moschino- if I'm not mistaken- or at least someone did lol- between hautelook, gilt, topsecret, and all the others- I forget who has what- and always end up missing the good stuff by the time they send me a reminder notice
 
I have a membership but I have never used it! Can anyone tell me how these sales work? Do they sell out quickly? Are there any shopping limits? I really love Botkier bags even though i am new to purchasing them. I really love the Lita bags!