Quite simply: HELL YES!!!!!!!
I absolutly luv that film! It is incredibly suspenseful and really makes you feel and emphasise with the lead characters. Personally I think it is brilliant and horribly under-rated. It is also quite genuinely scary at times (esp. if you believe in the supernatural etc) and has a great story. The score to the film is brilliant and so is the direction (the huge juxtaposition caused when the 'spirit' comes and attacks the woman and her family).
That's what I think anyway.
I'd reccomend it!