Naturalisation and citizenship in Poland

What are the requirements for acquiring citizenship in Poland? For example, length of residence, language requirements, employment etc..
--> note that they change the rules every now and then.
the rules are kept here -- http://www.migrant.info.pl/how-to-obtai … nship.html
Recognition as a Polish citizen shall be granted to:

a foreigner residing continuously in Poland (what is an uninterrupted stay?->) for at least 3 years on the basis of a permanent residence permit -> or a long-term EU resident permit -> and who has a stable and regular source of income in Poland and legal title to the occupied dwelling->;
a foreigner residing continuously in Poland (what is an uninterrupted stay?->) for at least 2 years on the basis of a permanent residence permit -> or a long-term EU resident permit  -> and who has been married to a Polish citizen for at least three years or holds no citizenship;
a foreigner residing continuously in Poland (what is an uninterrupted stay?->) for at least 2 years on the basis of a permanent residence permit -> which was obtained in connection with refugee status granted in Poland;
a minor foreigner with one parent who is a Polish citizen residing in Poland on the basis of a permanent residence permit -> or a long-term EU resident permit ->, and the other parent who does not hold Polish citizenship has agreed to this recognition;
a minor foreigner with at least one parent whose Polish citizenship has been restored, if the minor resides in Poland on the basis of a permanent residence permit -> or a long-term EU resident permit -[gt] and the other parent who does not have Polish citizenship has agreed to this recognition;
a foreigner residing continuously and legally in Poland for at least 10 years (what is an uninterrupted stay?->) who meets all of the following conditions:

What formalities are involved in the process?
- loads of formalities.
- language needs to be at B1 level at least

What is the policy on dual-citizenship in Poland? Do you have to give up your former nationality?
- Poland's policy is basically "we don't care what other nationalities you may have.  if you have polish citizenship, we ignore everything else" -- but, going by your name, you are Indian -- India does not allow dual citizenship

What are the advantages and benefits of acquiring Polish citizenship, in your opinion?
- Advantages: you can travel around more and work in more places.  If your family is in Poland (as mine is), it is only logical to get Polish citizenship
- disadvantages: if your family is not in Poland, it probably doesn't make sense to get citizenship