I have bought the n72 some 6 months back and it is working good. the basic reason for up gradation was that I need more memory storage, take some photographs and I also need some word and excel file to be added.
soon after my purcahase, I have replaced the original memory card with 1gb memory cad and I could not work with it because it could handle such a heavy memory so I replaced with 512 mdb card and now it is ok. the best possible working memory with n72 is 512mb only.
The positive features of n72 are
Like all nokio it is user friendly
Rough and tough
Good touch and finish
The loudspeaker and mic are so good so that I can keep my phone in my lap in loud speaker mode and I can drive my car
Photos are good
the negative features of n72 are
The silver stripes found in the case goes away with time ( is it the quality of nokio - I wonder)
Some times it gets hanged (two time so far)
Even though I can read word or excel files in my mobile editing them is not possible
anyway you look at it it is 70% value for money