I think that's a fair point really many still use them and many my friends still do without any problems, the obvious difficulty is locating them securely some choose the bulk head some ratchet the secure holding points some buy a frame, I used them for over 20 years no issues could have in this van
I personally went with grippa as I didn't wish to install another system myself again and I just preferred the overall look of grippa and the customer service also I wanted there front cabinet where They've installed a 12 volt heater to keep pumps protected
also when I mentioned to my insurance company grippa is crash tested it lowered my insurance costs without any issues at all I pay about £200 on brand new transit connect connect ltd 115bhp which I think is cheap
All my other vans had secured water tanks retro fitted ( various locations depeding on the van )it always was the same rubbish every year is it modified is it not always reflecting with a larger premium, i know wydale tanks are safe as I hit a stationary object about 7 years ago at 50mph with a 350ltre in back of my Citroen c crosser Strapped to rear seats
I'm Also sure all the other companies offer good customer service, as you would expect them to with the prices of a designed and installed system, grippa come to you To install which is why They also appeal to me As I could keep working in the spare van