About 2 years ago I got a Lampi (L5) with VC and analogue inputs. I don't remember using the analogue inputs because my music was all USB input from a MacBook Pro, then an Aurender. However I did comparisons (also with a couple of high end friends) between having my £10K pre-amp in the system or not. The sound was clearly more alive and dynamic without the pre-amp.
I sold the pre-amp. I now have a GG Head DAC with VC and analogue inputs (in case I need them at some stage) and have never regretted my decision. I know this isn't quite the same as using the analogue inputs themselves, but I have no reason to think the result would been different.
Hope this helps.
Philip