Personal opinion about PTC sites

So friends in this post you will get some of my personal opinion about PTC sites. I think these are the slow way to earn you will leave it in few day. I have talked to many people about this thing and they do not got a good opinion about it because some one says that these sites just got there work but they do not pay some one says these sites are just for time waste. but my opinion is deferent that all these sites are paying but its work is very slow you can earn but not in a great way like adsense or any other thing else i am not saying leave this business but i am talking to you about start a business means two at one time and be careful of those sites which are not paying and do not believe in common sites but try to get on those PTC site which are very famouse and paying to your friends.