John, there are lots of positive things said about GNSC.
There are few things to consider when you do mods. One of them and it's major, is that a resale value is very low. You would most likely not be able to recover 1/2 of the money spent. That is of course if you don't like the unit and want to sell it. I've gone through some upgrades and ended up loosing a nice amount of $ when I sold these, so from now on, basically my personal approach is to get another preamp instead of upgrading. But that's just me.....
There are few things to consider when you do mods. One of them and it's major, is that a resale value is very low. You would most likely not be able to recover 1/2 of the money spent. That is of course if you don't like the unit and want to sell it. I've gone through some upgrades and ended up loosing a nice amount of $ when I sold these, so from now on, basically my personal approach is to get another preamp instead of upgrading. But that's just me.....