i've been using IR 231 with the boot for about 8 years now for basic 1/2 jobs. i have a stronger Cornwell as backup that i got about a year ago and have never even used, as the IR always gets it done. few drops of oil and a pull of the trigger at the end of the day and it'll last forever, probably.
i also have a cordless Mac 1/2 in the work truck that is great but heavy and needs a large and expensive battery to wake up the torque ratings. minimum of a 5ah Dewalt/Mac battery to make any real power. that is inconvenient when i usually am also using batteries for other things like lights, cordless ratchets, 3/8 impacts, etc.
whatever floats your boat but if you're searching in the pneumatic market the IR 231 is phenomenal and will last you. i suggest a boot to protect it though.