Always interesting to read views on these things. Many pros and cons. I personally would not bother, the air consumption is the main issue. A sub 12 will give 50 yards in .177, is easier around buildings and quiet. I managed 23 woodies from a hide this spring with a small BSA Ultra in a few hours, some at 55 yards. A really pleasing morning that was. They didnt spook, all they did was drop as it is silent.
The pellet ballistics are a nightmare in wind, somedays you just cannot shoot.
I would personally opt for .17 rather than FAC pcp. More useful and much more effective.
The bigger caliber may have its place though. Watching Daystate in .303 is interesting, but I think that one needs a while to prove itself.
I suppose it is nice to have the choice and all options. It may suit some for a particular purpose. A bit too niche?