Heres my .02, Ive had the MV50, Extreme Outback, CO2, Oasis, and ARB compressor.
Remember Im in the Denver area, wheel in the mountains, at altitude.
So heres my personal review of the compressors that Ive personaly used.
MV50:
extreamly/painfully slow, I used this about 4 runs, then it died..
Slow is not always a bad thing, it gives you time to socialize with friends, it is bad, when its real cold and raining and you want to fill up fast.
I paid $25 for mine, lasted about 4 runs then would keep blowing the fuse.
Extreme Outback:
If I remember, this was a little faster, but still pretty slow here in the mountains, its bigger than the MV50 but worked, and after a few VERY cold runs, trying to fill up in the sleet and freezing rain, I wanted something faster.
CO2:
This was the fastest one out of all that Ive tried when filling tires. It does run out though,lol I had a 20# tank, that was much bigger, but lots fater to fill up. Depending on where you live it can get spendy filling the bottle, I would go through a bottle about every 2 months, and started looking for something that was fast, and that I wouldnt have to refill every few months.
OASIS:
If you have the room to mount this bad boy, IMHO its best, fill VERY fast, very strong, but, its huge, and has to be mounted upright, and get very hot, these are so expensive.
ARB:
Now Im running an ARB (ckma12) to a 2G tank, and a gauge in the cab, this is not, the fastest, but its small and you can mount this thing just about anywhere.
Ive got the tank mounted in the cargo area, with plans to mount a couple bigger tanks where the stock spare goes. With a fill tank airing up doesnt take long at all, untill the tank is empty, lol but I never run out of air, and is used to stock the camp fire :victory:
In the end, out of all the compressors Ive used, Im happry with the ARB, for its size, power, easy of mounting locations, never having to worry if I have enough air.
I have been looking into a small CO2 set up, maybe a 10# tank just incase something happens to the ARB, I doubt it will, but would be nice to have a back-up, lol
Heres a Review if it hasnt already been posted:
http://www.parksoffroad.com/prodreview/inflatortest/inflatormain.htm