I had the ini version for a short time. I like the sounds and panel, and I could even forgive the party bus interior lighting. But what made me remove it was the fact that it played games with my default pilot voice in ATC interactions. Even with male avatars selected for both front seats, the sim would assign me a female voice, even when flying other planes. I never could figure it out until I asked myself what was the last change made, and it was the Spartan. I yanked it, and my ATC voice went back to normal.
The same voice issue also happened when I installed the "Otto" avatar inspired by one of the funniest movies ever made. I loved having it next to me, but I won't put up with a misrepresented voice...