Opinions on Quicksilver Valve Linestage Preamp


Anyone with first hand experience with is tube preamp? Considering this preamp as a possible upgrade from my NAD C165BEE but I’d like to be sure that it’ll be a real upgrade. I honestly think the NAD piece sounds quite decent but hear too much about how a tube preamp will add to the musicality, etc. FWIW, they are both priced at $1K mark. It’ll be feeding my hybrid Vincent SP331 amp and the specs suggest they should be a good match.

Edited to add one more option in that general price range: Sonic Frontiers Pre 1L Tube Preamp .

Thanks.
128x128kalali
Love love my QS 6922-based line stage and listen to it multiple hours a day 365 a year w/o issues. I've also owned the 165BEE (nice piece as well), and I think the QS is the better of the two. 
Thanks for the input. Both of these components are very reasonably priced in the used market and seem like great opportunities to jump in to explore a tube preamplifier in the system. QS tube amplifiers certainly have a great reputation.
There's no such thing as a Sonic Frontiers Pre 1L. Are you sure its not an SFL1? If it's an SFL1, I would definitely take it over the NAD or QS.
The SF model is advertised as an Anthem brand supposedly "made by" SF. Not sure what that means.
Anthem is a different brand. It was owned by SF but the products are completely different. I would go with the QS over an Anthem.