I have two 90 c1 Ninja bottles. One 8 years old, the other 5 years old. Started with the Gold 3000 PSI output regulated version, but I managed to destroy the first one (stupidity on my part) and the second reg needs a rebuild. I replaced the regulator on the first one with a Jubilee Valve (5/8 inch neck if you need one) and it still works great. The Ninja valves are not easily available due to supply chain shortages.
The regulated version is nice if you are concerned with overfilling your gun. Bottle can be at 4500 and output is only 3000 no matter what. The Jubilee Valve is just a valve and allows me to put full pressure into my guns. PA sells the Jubilee Valve in both 5/8 for paintball tanks and 7/8 for scuba tanks.
Never counted the number of fills for my Marauder (I think it has a 180cc tube) so can't tell you how many fills but I think it's between 6 and 12 fills. Since the tube on a P-Rod is considerably smaller, you'll get more fills.