We make an eight-channel unit, for surround work, and we use the same Vu meter in our MSS-10 microphone preamplifier (single-channel, one meter per).
From our experience, the companies that make meters are quickly losing the ability to make consistent, accurate Vu meters with appropriate ballistics. This is causing us big problems!
We do have enough appropriate meters for an upcoming manufacturing run, and what seems to be a reliable source for meters at a very high price. I hope analog Vu meters with proper ballistics will not become extinct, soon.