Comment to describe main limitations and advantages of handhelds

Since I am a PDA user ,I have some experience to share.
Limitations:
1.The handheld are still an expensive product even in an organization like school, the surface are easily damage, how can you say to the student "Hay!becareful ,don't write on the screen too hard,you should pay it."
2.There are always technical problem related to the handheld user, even the technical assistance in school can not solve the problem since the expensive product are not too common. 3.The high technology product always have a problem in outdated rapidly.
4. It face the serious problem of power supply that I always met in the important moment, so the reliability problem are found.
Advantages of handhelds
1.Paying bills, searching and buying your favorites things every time and everywhere if you are solving the security problem.
2.You can enjoy a portable audio materials (radio, MP3 songs)and photos, video, TV, books, E-magazine ,etc…
3.You can take minutes, design project, using words or excel, power-point to present you job, and showing picture at once.
Educational value in a school library
1.If the supporting material and facility are sufficient, student can learn or get the learning materials everywhere and every times.
2.It will have a high efficient search environment and for a school it benefit too much student, it is comparatively low in cost.
3.Handhelds are carried easily since it had a small size, a lot of software help the student to finish project independently(e.g. map and GPS can state their position and guide them to where they want to go.)
Potential uses in a school library
For the library using, handheld can check all the library collection, borrowing and reading E-book, using internet, easily get the prepared project-base material.