I have indeed and it's a great pairing. I also auditioned the V1 & Phi with it and it works well with all of them. It's worth noting though, that these are the first headphones I've used with it where I found it necessary to use the 'Normal' (middle) power mode as opposed to 'Eco' (lowest) on the BL. With both variations of the Diana the Eco mode sounds considerably thinner, albeit still crystal clear. To me this is inline with what Abyss have said about their cans needing a lot of power to drive properly.Thanks for the heads up!
I see that you have the Black Label... have you tried that with the Diana V2?
I also briefly auditioned the Phi with the WA11 on the same day and it sounded fine to me, not really better in any way than the BL, but this was a very quick audition, not a thorough test. But I have to wade into some of the discourse so far... it absolutely does not sound 'trash'. The WA11 though does seem like a pretty unreasonable ask, given the price, however. Even if the iDSD BL proved to be any less capable in audio reproduction, the incredibly clever design and engineering of it blow the competition away, in my opinion. The BL sounds great and is basically a Swiss-army knife device in it's utility. The fact that the iDSD BL doubles as a true desktop solution adds greatly to this (the BL has a smart charging feature that stops it overcharging the battery when plugged in, preserving battery life).
Combined with my recent experience and the wide range of comments people have made in regards to elements such as bass quantity on the Diana's, I can't help but agree with Abyss' emphasis on the importance of upstream gear & correct fit. For example, people have commented about the Dianna's being bass light, or thin, or some other similar sentiment. When run through either my Mini or iDSD BL (on normal power mode) & with the fit set up as per Abyss instructions, these statements made without filtered through the gear they're using are simply inaccurate. This isn't a slight against anyone in particular, but it's also not 'people hear things differently'. I'd say that with the Dianna, and other demanding gear, it's very important to qualify what gear you're using, as it drastically affects the sound.
Also, FWIW, I have briefly tried the V2 through a Modius -> Drop THX789 and they sounded bad. I haven't tested much beyond trying to eject immediately, so I'll save further impression until I do, but it was not pleasant.