If you open the van doors and have a neb, i agree its nicer to see a van set up by grippa or ionics or pure freedom for instance. But
To be fair, who cares as no one really sees in the van. So for me its easier to simply transfer water into a tank in the van with a crash tested cage or not. (Tho totally understand if employing ones would be wise to use a tested cage).
The money maker for me is in how you get the water from the van tank to the window. This is where it counts and personally where i feel ones can stand out. If you have a diy brush on a painter n decorators pole for instance compared to a carbon pole for the job and appropriate brush and connections for the job at hand.
Thats where for me the money should be spent but its also worth shopping around for and experimenting. Ie, i know i can work with a tds of 010 for instance and not have any problems. My RO will reduce my water down to 007. My DI is raising above 000 so do i go spend money every so many months because im paranoid about using 000tds water............NO for me thats wasting money. Once it goes higher than my RO i might consider refilling at that point. But thats where my knowledge of my work, my climate and my water enables me to decide.
My current brush is just less than £40 delivered and will need replacing perhaps by time its a yr old. Will i wait to replace, NO because a good brush makes my money faster and you soon make that back.