I have been told that don't accept payments via paypal, is that right?
Because when buyer will have his bitcoins then he can claim back money from paypal by saying that i haven't received desired product.
There is no way bitcoin is better than paypal in terms of security of users, on the bitcoin channel, you can easily get ripped off your cash and would be left with no way of getting your money back, but on paypal the money can still be recalled for you if you have solid proof.