I'd worry about warranty being honored if you had problems once you brought it back.
that's almost guaranteed - if there are problems with the screen you will have major problems/arguments getting support or returning it.
If you take the risk and it all works out then great, otherwise get ready for a major pain in the bum.
FWIW I'm thinking of doing something similar
It's good to know I won't be the only one
For the warranty, I'll check the screen for dead pixels and other problems before going home, then if there is a problem it would be my fault anyway
I think I'm going to try to wait until my summer holiday, the extra savings will go into a better computer at the end of the year
That's if one of my 6+ year old CRT's doesn't explode, and if I can live with the high pitched sound the one has recently started to make