I've never heard that except if you use it for pitch to MIDI. The whole point in the GK system is that the pickup works like a normal pickup and processes each string in real time with zero (or as close to) latency, as nothing is being converted.
I am super sensitive to ANY latency (I sold all my wireless transmitters, iRigs and so forth because of it)! The VB99 has none at all.
Think of it as an amazing effects processor, and if you use a 13 pin import those effects can be assigned to individual strings, you can move pickups around, model different string types, octave strings individually - literally after 10 years I'm still dreaming up new things to try.
But at it's core, it's a superb sounding pre-amp/interface with the best compressors/limiters and most flexible and subtle adjustments possible.
*hugs for my Roland*