I agree. They are just better in every way than the normal Elrogs. The MO's are more technical than then ER's and even more technical than the TM's, but the TM's have that added musicality factor which the MO's completely lacked and the ER's are also only mediocre at. Yes, the midrange of the TM's ist just sublime, combined with their technicalities and the wonderful decay, they are just the best tubes that exist. They are still not as warm and full sounding as Western Electrics, but they just sound right, with every headphone you throw at them, they just have no weakness at all. Every single aspect, be it bass, mids, treble, separation, speed, decay or attack is at least a 9/10, often a 10/10. Every other 300B pair does not come close to the magic allrounder that the TM's are and has a weakness somewhere, not the TM's.
Sadly their pricetag is extremely high, that's why i cycle through my 300B pairs.