If you can't afford a proper tablet made by a reputable tablet manufacturer then you can't afford a tablet. Period.
Uh what? thats like saying that unless you can afford a Mercedes Benz, you should not be buying a car.
Not everyone has the budget for an iPad or Asus Transformer Pad Infinity. Or at least, maybe the OP has the budget for it but would rather spend it on other things, like a retirement annuity. Or are you going to advise that they blow all their cash as quickly as possible?
Heck, considering the OP is only buying this for a holiday, and might never use the thing again, it makes perfect sense to go cheap.