Sorry bro but if it was built using hormones and your going off for some time you will lose pretty well all of it. When you go you will not even feel like training but try to force yourself to get to the gym. Thats the truth not some crap PCT will save you, it wont. Been there. Just stay on or your going to regret coming off.
Yes, with or without a PCT plan you're going to lose some muscle, that's indisputable. Even so, the guy who runs a PCT plan should be able to keep a little more. Will it be a massive difference? Probably not, but I for one would want to take every advantage I can.
That said, most of you seem to be missing the big picture when it comes to PCT, and the big picture has nothing to do with keeping or losing muscle. When you come off, your testosterone levels are going to be low, and assuming you're going to be off for a good while (which is exactly what this thread implies) while your levels will continue to naturally climb it can take a year or more to fully recover. Varying factors will determine the total recovery as well as an inability should that occur.
Then we have the guy who runs a PCT plan, and no, there's no PCT plan on earth that is going to fully recover your testosterone levels, but it will stimulate enough natural testosterone for you to function properly while your levels continue to climb naturally, and while it will still take a good bit of time after PCT to fully recover, it's going to be faster.
People can continue to knock it, but a low testosterone condition is probably one of the most unhealthy conditions you can put your body into, and if you're off-cycle and off for an extended period of time that's exactly what's going to happen unless you take some kind of action.
Last thing, more of a side-note....not everyone wants to stay on all the time, not everyone can, and if this happens, especially the latter, telling someone to skip a PCT plan because some internet cowboy said it was for pussies, well this is idiotic.