I was going to purchase MD3 TDM because I have been using MAster X 3+5 for many years and I still like it.
TC needs to increase their Demo period. 15 days is just too little.
Yes, MD3 EQ sectin is pretty sweet, no metallic sound as we sometimes found with MAster X (3+5).
I have been using Xenon on every mstering section and yesterday I had the opportunity to compare Sonnox Oxford Limiter versus Xenon.
I preferred the sound of Xenon. Sonnox seemed to add a slight low mid, which may be or not a good thing.
The exciter session needs to be used with caution, it can make your source sound somewhat harsh.
I also have Mc DSP ML4000 but I still prefer single band units.
So, at the moment I use two instances of Xenon or a combination of TC Master X 3+5 limiting section and one instance of Xenon.