These little tanks are great. The only beef I have is that a tank is only good for 5 years before it needs to be tested which costs more han a new tank.
I ordered a half dozen of these and not a single one was good for more than 3 years. It's like they have been sitting way too long.
Kind of disappointed, but I'll make good use of it while I can.
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Half Expired
January 3, 2013
Reviewer:
Derek
from Cambridge, ON Canada
Save your money and buy one that you can see the Re Hydro date. It's right on the bottle from the manufacturer and this one is half way done. Another reviewer describes a similar experience. Otherwise, I'll be carrying it as an ultra light backup. Buyer beware.
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Does not require re-hydro
December 31, 2012
Reviewer:
Carlos Coutinho
from Seekonk, MA United States
For those who don't know, there is a "2x2" rule. Less than 2 feet long and 2 inches in diameter, you don't need to re-hydro. This applies for HPA tanks too, like a 13ci tank. I have a 4oz tank from 1997 that's still fine.
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4 oz co2 tank
November 19, 2012
Reviewer:
Alma AVENDANO
from Freeport , TX United States
Overall great to. have wish there was a 6 oz co2 tank I would buy them all day long . That aside I have two 4 oz co2 tanks and love them ultra lite get around 200 effective shots a tank on mr1 Great for pump gun.
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It's cheap, it's small, it's a tank for C02
August 16, 2012
Reviewer:
Magilla Gorilla
from Lake Forest Park, WA United States
As the previous poster mentioned, check the Born On date - mine was also already two years into its 5 year lifespan. However, in the remaining 3 years of its life, how often will I be refilling this and using it? For the price I paid, this is well worth it compared to buying scads of C02 powerlets (and having to change them out more frequently). Plus, it is just the right size for my CCI Phantom to position it where my Quick-Change powerlet setup was.
Tank is fine, hydro date is no good. 
Half Expired