Personally, most of my box wine experiences have been pretty negative or bland at best. However, I recently bought the Target brand Cabernet/Shiraz Blend, and found it fairly decent, certainly better than Two Buck Chuck or other similar house cheap wines. I bought it originally for a holiday party in a suite in Vegas (who wants to hall 4 bottles through a casino?) and it worked well enough to try it again at home. There I usually enjoy a nice bottle first and then switch to the box (or open a cheaper bottle) after dinner if I want more.
I will probably bring a box or two in addition to our 2 cases of beer to extend our "reasonable alcohol allotment".
So, what experience, recommendation or warnings do you have with specific boxed wine(s)?