Upgrading brings the VK60 to similar sonics as the 75SE and well worth the $2500 unless you need the additional power of the 75. This is a major sonic improvement that makes the 60 even more liquid. In fact, one of the best sonic values would be to buy a used later version 60 and have it upgraded. I believe early models require additional changes so the mod cost is more than $2500.
Anyone update your BAT VK60 to SE status?
What did you think? Worth the $2500? My other choice is to buy a 75se and sell the 60. More than double the price of the update though...