I thought about making-up a bucket and hose arrangement for shot blasting myself, but in the end it was easier to just send for one of these. It was smaller than I thought it would be, but it does take a whole bag of shot (22KG bag) which is the stated capacity in the advert. A neat solution for the job of holding the grit. It should last for many years.
I use a 100LTR-3HP-14.5CFM CLARK compressor to run the kit, which it does very well. I can clean a rusty 4" square patch of chain maille armour in seconds, then go on too another patch. this saves endless time using a concrete mixer and the blasting kit does a far superior job (it's also more fun) The links look nice and clean afterwards, which is the whole point of the blaster. Also, there being no rust left, you won't dirty your nice off-white gambeson (thickly padded garment worn under armour)
You will also need a hood of some kind to protect yourself from all the grit flying about, goggles are not good enough. The grit goes everywhere you can imagine, even 15ft behind you so wear the proper clothing. I haven't tried it out on ordinary metal yet i.e. box section/round tubing etc., but I don't see why it wouldn't do a good job on that type of work as well.
I highly recommend this blasting kit for chain maille (medieval re-enactors take note) and other types of jobs that need sand blasting.