I’m actually one of the few who can say that. I helped make MS4 but we never finished it. Also eclipse was poorly designed form the get go when using MS4 as a base. All the packets got messed with and none of which was really any improvements. Then they added dynamic maps which was stupid to begin with they should have done seamless instead. Yes seamless does take a little more effort but its a much better overall system than one huge map which can be anywhere from i believe it was 3kb smallest map size to 4mb which is max map size with a few basic layers. Anyways me a spodi use to talk a crap ton about all this stuff and he did at least try to improve and make net-gore cleaner before completely giving up on it.
I won’t say mirage is perfect, because i know its far from it. I also won’t say eclipse is any better because in all honesty it is worse. Overall though netgore is much much worse than eclipse. The only advantage it gives you is that it was done in a language which can utilize threading and newer rendering libraries.