I bought the Mad Dog and the Dragonfly few months ago and found out that Dragonfly cannot drive the Mad Dog well. So I got the Lyr but I did not like it too much as it was a bit foggy and colored for my taste, or at least with the stock tubes. I did not want to spend a fortune and lots of time playing with various tubes so I bought the Soloist instead. What a combo!
 
Besides that it has three inputs and can be used as a pre-amp!
 
I was debating if I should put the price to Pros or Cons and decided to leave this decision for you!