hi there senechal-- i can only speak from my own experience- and mine has been an awesome one...
i have two 6.5 month old gtps. i got them at 3 months old. in the beginning-- wow-- whenever i had to handle them- for weighing - soaking - cleaning the viv- omg i had to wear gloves-- they bit the crap out of me--- at least 5 times each.-- insane biting.
but... then time went on-- i always put my finger on their head the minute i open the viv- well they started to get used to it and i picked them up w/ o the glove-- they were cool- no biting-- but-- i did wait awhile--... now -- i tap them on the head-- and they climb on to my bare hand. they are so amazing- so satisifying. its insane-- i am absolutely crazy for gtps. such a great reptile-- i highly recommend owning one if you can handle the responsibility-- their vivs are not easy to maintain humidity wise.... so yes-- lots of time and effort is required but let me tell you--- well worth it- i love gtps...
sincerely,
jack