As we low brass musicians well know, the bigger the horn, the more brass that goes into making it. All other things being equal (when they are) a Euphonium will cost more than a Trumpet. So also will a Euphonium mute cost more than the same model that is sold for Trumpets. The DW Practice Mute costs ~$170, that might legitimately put off a musician that doesn't actually need one to keep from being evicted from their apartment. Practice mutes have benefits besides the obvious one, however, I recommend the serious euphoniumist consider trying one.
There is that, but the purpose of my review is mainly to show the unacquainted reader just what this mute actually looks like in the real world. I'm sure you've seen the product photos on various retailers websites, and possibly the Denis Wick site itself. It looks rather like this, in fact. Let's try that again, this time with a 1L sparkling water bottle for reference. Here you go. I don't know about anyone else, but I was impressed. The smaller mute to the left is a practice mute for a French Horn. Another illustration I think might be useful is the DW5512 in situ, ready to rumble. Literally. Pedals are possible with this mute in place. It is not nearly as top heavy as it looks.
But, how does it play? Just fine, I think. Compared to the practice mute I have for the Horn, the Euph mute is MUCH better in tune. I personally cannot detect intonation anomalies with it in. I can easily do so with the Pampet (Horn) mute. Another thing that I can do with the euph mute that cannot be done with the horn mute is play the full range of the instrument with it. Double pedals are possible with the Wick mute. I find it very satisfying to warm up with the practice mute because right from go the first notes with cold lips speak well. I find myself spending a couple of minutes just blowing Middle C without the mute until they are ready for more.
So, all in all, I recommend a Denis Wick practice mute. You will probably NOT want to use it for backstage warm-ups, there are 'travel mutes' for that. You might be tempted to just use a travel mute for all your practice and performance warm-up needs. That isn't what I chose to do, but I can see the wisdom in that. I have that luxury with the Pampet mute of using it as both practice and performance warm-up aid. I doubt you can get down to pedals range with a travel mute, however. Again, as I said earlier, my aim here was to give the reader a visual of just what this mute is about. That is not something I've seen elsewhere. Not unless there are YouTube videos reviewing this mute. But for those who are not regular YouTube watchers, this review just may be informative.