First week report for the 3 in 1 framing nailer from HF.. I am not a professional builder, carpenter, any of that "er" stuff and if you are, why are you trolling this thread lol
First it is incredibly cheap (pricewise) bought it for 119 and it goes on sale for 99 in 2 days so I will be going back for that credit
The good:
compared to those I picked up at the local HD it seems to be in the same weight class not much lighter like most cheaper products usually are
Instructions are easy and are on the nail rail of the gun so you don't have to keep going back to printed manual depending on what nails you are using
It misfired only twice, and exactly as described if it gets too low on nails.. Both times while shooting nails upwards and with only 3 nails left in the rail
Used it with both 21 deg and 34 degree 2" , 3-1/4", and 3-1/2" nails.. The 21 deg nails were Dewalt brand bought at HD the 34 degree were bought at HF. It fired both easily
Framed and built most of a one sided barn this past weekend. Will put up pics and a build thread shortly
Extremely efficient on air.. was set at 68 lbs to set 3"+ nails that is 2 lbs lighter than recommended in the manual
The bad
Cannot plunge fire the nail gun.. It has to press and then pull trigger to fire.. Not really a bad thing but I thought it should be able to plunge fire
The grip is a little small (diameter) in my opinion but I cannot tell you if others are larger. Maybe they are all that small? Maybe I have big hands? 
Unrelated bad:
Although the nails at HF are much cheaper this time they actually come that way because they suck.. I bought the 34 degree ringed nails and the plastic glue on the ends never melted they pulled fairly easy whereas the dewalt nails that plastic glue seemed to melt when driven in and was much, much harder to remove the nail..
So far a great purchase, time will tell as I have a house to build.. If it survives that then it is a great great purchase