the main problem with lead free is that it doesn't flow as well as leaded esp on fine soldering, also i would say that solder points won't be as strong. Its good enough for some, not for others i suppose it all depends how seriously you take what your doing. I have used lead free when i first started and some of the toys i made 7 years ago are still going strong, it can be bad for developing short circuits though, but i always used to use a tiny bit of hot glue on solder points to stop things moving against each other when i used lead free.
On the plus side it wont give you horrendous lead poisoning and its free, so i would weigh up the options and email me if you want it. If it was a wee bit i would probably chuck it, but there is almost 200g there, seems a shame if someone can use it.