The threads will give you any number of personal opinions.
Unfortunately, most of them are from people who met someone on a course once who had a mate in 4 Para, or people who thought about joining once. Some are even from people who managed a few weeks on the course 10 years ago!
There are people on here who are currently serving and actively involved in the recruit training process - they have all posted clear detailed advice in the other threads, and knocked a lot of the rumours flat where appropriate.
The website gives very clear guidance, and links to some useful information about P Coy.