I recently purchased these and I am very impressed by them although I got to listen briefly. One thing I noticed that if your recording is bad, they will sound bad like most expensive speakers would sound good no matter how good/bad the recording is. Obviously this is a good thing but in real life with most recordings being OK quality, not too sure.
I am not planning on doing any mods. 1- I am not THAT handy. 2- I am not too sure if all that make a huge difference. Felt around the tweeter is an easy test. Maybe will try that tweak/mod.
Overall, in today’s used prices around $700-$800, nothing can touch these.