To
Eddie TX I have found both the Klanghelm and the PSP meters are spot on with meter ballistics. It is simply a GUI thing. I think I like the warmer look of the PSP that is all. They are slightly bigger too. But no biggie. Pure a look thing for me. The PSP gives you a second type of meter too.
Overall they both compare well to the real VU. I must admit there is something very nice about the way the real VU moves for sure. I have got used to it. My real VU's are sitting on the output of my digital mixer showing my main stereo buss all the time. They also show tracks and busses as soon as you solo them though.
My (computer) monitor actually sits on top of my VU meter box so I can put the VST's low on the screen and they end up right above the real VU's visually. You need to be able to view all the meters moving at once. (from the right distance back)
The first test I do is an overshoot test. Precise bursts of 300 ms tones will show you this. Both the real and the virtual needles need to take the same time to reach 0dB VU, they should both stop right on 0dB VU (and not overshoot) and they do and they should fall back at the same time to rest and they do.
Continuous pink noise shows some interesting behaviour between the two types. Then there is music of course. Once again 'Steely Dan comes to the rescue here for the perfect amount of movement within a meter ballistic for any given music segment.
I am very happy to say you certainly don't have to go out now and build a real live stereo VU system. It is quite fiddly to do. You need expensive meters, circuitry to drive them properly and accurately and a nice box to put them in and get their lights working. The only real advantage of a real VU system is that you never have to insert the VST's anywhere because they are just permanently on which is cool. With VST's you have to insert them where they are needed.
But the VST's will certainly look after your VU metering needs if you want to work within the K system for tracking and mixing and also during mastering etc.. They are a great too anywhere in the production system. They can tell you so much, not just how loud things are and what your rms levels basically are but also in how they move over a mix etc. You can learn a lot from watching how the meters move over commercial mixes etc.