Have owned these for more than 3 years with a Hegel H-160 pair 2 years ago. Also has a pair of Dynaudio Excite X-34s, which are also driven by the 160's.
Mantra is a difficult speaker to let go of. It has a vividness that excite does not come close to. It plays more openly, more dynamic and engaging. Instrument has a natural sound. It paints a sound image with good instrument separation and a rocky focus on everything that happens in the music.
Particularly good at rock / metal and acoustic music.
What I can feel is that sometimes it's going to get well sprained and dry in order to deliver voices. The evening strained. This depends in part on the amplifier that tightens the tight hold. Had previously Hegel H-80 where I experienced voices a bit softer and warmer than I do with 160 together with Mantra. So finding a good matching amplifier for Mantra is A and O to make it sound as good as possible.
Excite feels in pure comparison like to embed everything in cotton. Soft, not the same attack, and feels a bit gray with mainly metal. Simply, not as fun and fun as Mantra. On the other hand, I think Excite sounds a bit better with less demanding music, where Mantra can be a bit thin in his play.
Two different speakers with different qualities that have their own game styles. In the end, it's what you prefer and which amplifier you have to control your choice / outcome.