The nitrogen will stay in pressurised tanks for years, and they maintain the correct pressure and volume over time, which is a major advantage. It will always be prepared to act quickly (if the valves work). But if you rent a pressurised tank, the owner often charges a monthly leasing fee for the tank, which adds up over time. If you have the option, it is preferable to get a pressurised tank that you can fill as necessary.

Pressure tanks have a date stamp for the most recent test, and they should be examined every five years. If the test period extends past the nominal test date, refilling stations are not permitted to refill.