No PCP here and don't even know what PCP stands for, but if you have access to a scuba tank and shop to fill it, that isn't a bad thing to have around the house. My scuba days have come and gone though my old 3,000 psi 80 cu. ft. aluminum tank is always filled and ready. That tank and Schrader valve attachment is portable and has saved me and the kids untold times for blowing up a flat tire, kiddy pool, air mattress, etc. It is no lightweight and I'd rather have an aluminum 50, but that is a lot of compressed air in one of those tanks and I'd sure think that it would fill a lot of PCP shooting rifles. The local scuba shop here charges around $5.00 to fill mine.
