Hi I have some I have had for 3-4 years as on ebay "Item number: 180130417257" my ones are SIP. If you oil them about once a month they just keep going they have done me. I have now down graded to a 2HP compressor as in Aldi and they still work very well
Good luck Dave
I have a very cheap air nibbler, i dont use it often but its okay, its identical to the red clarke ones.
When you need spare cutters/dies, you can get them in 5 packs elswhere for the ame as MM charge for one of each.
The shears will be quicker than the nibblers, but not leave as nice a edge. The round nibbles are quite painful if you get them in your knees etc, so be sure to make the swarf somewhere you can clean it up easy/aren't going to work on hands and knees.
My cheap shears tend to bind up every so often and require stripping off of the shoe to keep them cutting properly...