IR guy here. All of my good pneumatic tools are IR. Few drops of oil each day and it'll run for damn near forever.
IMHO, most people are unhappy with their air tools because they have undersized air compressors. Watch this video and learn about the differences between SCFM (how consumer grade air compressors are rated) and CFM (how all air tools are rated). I have a 5hp 100% duty cycle air compressor and it can not keep up with most of my air tools.
Thanks for sending the video along as well as the rec. 2 votes from guys that seem to know their tools works for me. If nothing else the video was hilarious. I'm probably undersized a bit as well but the 21 gallon tank that will put out 175 PSI and 4 stated SCFM at 90 PSI has worked just fine for most of my needs thus far and cycling time has been acceptable (light years ahead of my Dewalt Pancake compressor). Given power output thus far with a cutoff wheel, die grinder etc I would think that for quick breaking of bolts it should get the job done over my cordless version. A big issue that I've seen in IR reviews also seems to be folks buying them from dealers they can't get in contact with for service/etc, so that's easily mitigated...