Christmas in February - ADL 600

Hey Crew,
 
Excited to received my shiny box of tubes and transformers this week! Any experience here using the ADL 600 preamp? I've had getting one on a short list for about a year until found one on reverb.com for a good price. Transaction so far exceeds expectations. So props to the seller. Rambling here, just wanting to get my hands on it.  :)