I also have purchased a comparable one (90 liters space) 2 years ago on ebay for about 90 Euros incl. blast gun.
The box was worth every penny, as about 70 perent of blastable parts on a 71-73 fit into it. The largest parts I have blasted was an intake manifold and the air cleaner housing. Over the past years I have made hundredas of parts, screws and small stuff included.
The injector-type gun is prone to clogging. This seems to be a weak point in all of these cabinets. You need absolutely dry air and you need lots of it. My compressor is not capable of this, so after a minute of blasting I have to wait for the air tank on the compressor to refill.
The dust filter of the box also used to clog, so i modified it. If I didn't, there would be an overpressure buildup inside as the filter gets dirty over time.
I have also added two cheap 12V neon lamps to enhance the installed lighting which was a bit insufficient for comfortable work.
As blast media I use granulated copper slag, garnet, or korund in various grains. Not tried glass yet.
Here is a picture of the air cleaner snorkel in the box during blasting.
Michael