I use CO2 for two reasons:

1. Cost. I paid $20 for my 48 oz CO2 tank.
2. Number of shots per fill. I can shoot a whole case from one fill, and that's with an A-5.

How much would an HPA tank cost that could shoot a whole case? A lot more than $20 I'm sure...

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A5, 12" PPS Brass (.690) with Apex tip, Tacamo HK 416 shroud, Tacamo AK-47 Sight Cover, JCS Gold Powertube, E-Grip (APE), Core CQB Wire Stock w/ RVA, Palmer Inline Stabilizer, Lapco Cyclone Ratchet, 450 round Hopper, 48 oz CO2 with remote line

Sorry, but have never used co2 and hope i never have to. i got a 4500 psi carbon wrap tank the day i got my a-5

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A-5 14" Lapco Big shot W.A.S E-Grip, Tapco M-4 Tac stock, Vortex,Lighting Rod, QEPH,1/8 inch banjo fittings, x7 valve ,PMI remote line, 4500 psi. 68c.i. HPA ,Tac-Cap, Stove Pipe, Madman spring kit

I use a remote with my tank 68/4500 carbon wrapped tank and not having the added weight anywhere is great. i just got my tank 3 weeks ago and had a 48/3000 on my remote.. that thing was weight me down so much! weight is weight, it being on your pack or gun does make a difference... my .02 (actually more like .01654 due to the declining value of the dollar.)

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"I was getting ready to move up when I heard a voice call out to me and say 'Don't go there.It's a trap. Go back.' and it scared the *crap* out of me. so i went back because when a bush talks, you do exactly what it says." -Teammate recalling when I saved him from sure slaughter.

HPA Got tired of paying for CO2. As A firefighter we can fillour own tanks which after the inital outlay for the bottle, it is worth it. If you have your own bottles and a fill bottle check with your local fire station or scuba shop for refills.

same case here,literally.

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good idea.
I can get a big Co2 cylinder from my welding supplier for 69$,and fill at least 100 times,it pays for itself!

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Co2 for me because that's whats readily available to us at most fields here in Oz.

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HPA, its more reliable and consistent shot to shot than CO2 ever will be

I bought a used fiber-wrapped HPA tank. Hyro'd it once and it's still going strong. I just prefer it over CO2 for the consistency and yes, no white puffs. It's not affected by weather and size for size is lighter than CO2 tanks. No issues with any of the fields I've played at because while they will refill your HPA tank, they will only rent you their CO2 tank and will not refill the one you own. I'm very surprised by the availability (or lack of, rather) of HPA across the rest of the country!

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Hands down HPA is better in every way than CO2 but it all depends on whether you can have access to it or not or even maybe purchasing a tanks since they are all very expensive compared to CO2 tanks.

I use both at the moment just because i have 2 20oz CO2 tanks and 1 114/3000 HPA tank. As soon as i get the other HPA tanks plus a fill station. Bye bye CO2, HPA in my local shops is 6 bucks, i rather use that money onto something better than just air lol, plus for 5 bucks i get a 80cf tank filled.