I have the Diana Phi and they are really quite impressive. I bought them mainly for portable use but was pleased to find that they are equally, if not actually much more so, at home with higher grade kit. Don’t be put off by comments that they are too hard to drive because you can definitely use these as portables but they are possibly overkill if that will be their only application. Here’s how I’ve been using mine:
AK240 - a good fun and very pocketable portable solution.
AK380 - a nice step up from 240 with the difference between the two revealed very easily by the Phi. The gap was previously much smaller with lesser phones and I was pleasantly surprised by how much better 380 was
AK380 plus 380 amp - better still. Not as pocketable, but the sound quality is generally worth the weight
MojoPoly - I only use this for listening to video on my iPad or radio via Roon, but it works just fine
Hugo2Go - this combo does sound good. Bettered by the Utopia imo, but I personally feel that Utopia and Hugo2Go are an ideal pairIng
BluDave - amazing clarity, depth and detail. Still prefer Utopia, but it is marginal and, to a degree, a matter of taste
Manley Absolute - really good. They edge out the Utopia in this scenario and trail only my Susvara and not by as much as you might think
To summarise, the fact that they can make a very entertaining mobile solution - small, lightweight and easy to wear without looking like a Cyberman (see below) - and yet tangle with Utopia and even Susvara with the right equipment does make them a very versatile pair of phones indeed. If they were a bit more sensitive for wider mobile choice, they would be a no brainer, bar the price of course.