if i remeber correcttly a 200G drop is 1M onto hard concrete (take those figures with a grain of salt)
i havent had a problem with them and i treat it fairly badly (playing music while walking/runnig droping it) it depends on your usage patterns really
what it dosent like is heavy vibration. when you go to read the head will vibrate and things go awry. walking and such is a better pattern as there are long periods of "stillness" followed by a change in direction (relitive low G as well, i would calculate about 0.5G, i can do the calcs if you want)
With flash how fast it wears out really depends on usage patterns, how many spare sectors are avalible. all chips have non acsesseble spare sectors so that they can "patch" the damadged sectors, the lowwer capacity chip you get the more spare sectors you get. this is mainly because they only use a few flash chip sizes and remap how many spare sectors there are. they might do it slightly difrently but i know thats how they used to do it
another thing that affects the "burn out" time of flash is the quality of the chips. cheap asin semiconductor manufacturers are known to have thier cards burn out faster. i belive this is because they use less of the "remap" sectors than others and hence they run out faster
if you want to do the calculations to estimate the life of a flash chip (that is until there is 1 unrecoverable sector) then the calculations are a bit difficult if you dont know things such as how many writes there are to a given device otherwise take 100000 and divide that by the number of writes to the same sector per day. this should give you an estimated lifetime in days. keep in mind its very rough and varies from manufacturer to manufacturer
for refrence i have dropped my Z from 2M onto hard concrete while active and had no damadge sustained to the HD that normal tools can detect, it still works fine. i have also dropped it onto carpet from a hieght of 1m and it still works, they are tough, not as tough as a CF card (which you can nail to a tree and they still work, cant remeber the link) but quite close