I suspect hat the majority of VB Air gives satisfactory service. If someone kicks off about something it is usually noticed people do not constantly write in to say they are great very often so the reader can gain an unbalanced view. Its human nature to moan more than give credit and if someone has a grudge well...Just for balance. We have VB 4C air on our t6 LWB 4mot & love it. It’s now getting on for 8 yrs old & has been faultless. I would have no hesitation on having it fitted to our next van. As already said, it isn’t a “Show Pony” system, it’s a workhorse & does what it says on the tin.