I have one of them, and it's pretty good.
The knowledge that you have a tank that might not come through the bulkhead in an accident is quite rewarding. I say "might" deliberately, as a sop to the doubters. The normal argument on here goes that it's been tested in one van under one set of circumstances so the tests mean nothing. I just think that a system that's had some kind of test is infinitely less likely to hit me from behind than a tank held in with a set of bungee cords that someone reckons should hold it.
Mine's a 600l delivery only system and it's been flawless so far, bar one of the connectors on the exterior ports.
I had a twin pump setup because when one of them fails, I can switch over to the other immediately and carry on working. The alternative is cancelling a day's work, going home, ordering another pump, waiting for it to arrive then fitting it. At some point one of them will fail; I've just moved the purchase date of the replacement to the day I had the van kitted out.
Fitting was a delight. Drive to Cornwall, drop van off, then pass ten hours on foot in St Austell without going mad. Fortunately, my last trip was into a betting shop where I backed a 10/1 winner with a couple of quid which paid for the breakfast, lunch, coffees, cakes and biscuits that I'd eaten in a futile attempt to make the day pass quicker. Next time, I'll rent a car for the day and pootle off somewhere.
The last I heard from Alex is that he's going to be giving this more effort in spring. His focus will be on streamlining manufacturing the units to get prices lower. I really do hope so, as I would like to build my expansion on vans fitted with his equipment. I don't fancy paying the lunatic prices charged for other people's crash-tested systems, so I may have to wait.
Vin