I used my Radial JDI at 2 shows this weekend. Both shows I had it connected to my Alesis Andromeda which is used for String and Brass sounds (along with the occasional lead or punchy clavinet type sound). My other boards (Moog Voyager and Yamaha P90) went through Radial Pro DI's supplied by the sound company.
From a sound engineers perspective, the guys I worked with this weekend said that Radial pretty much makes the best stuff out there and that I'd made a good purchase. (They both use the same brand).
From my perspective, the JDI is well built and I've heard nothing negative about them so I'll use it.
I'd like to think I've just bought a quality product, and nothing I've read or heard has made me feel otherwise. DI's are necessary to have as a part of my rig so I don't mind spending money on high quality boxes and that they 'should' last me a long time. I'll be picking up a few more in the coming weeks (actually, I've already ordered a JDI duplex stereo DI).
The truth is, I'll never really know what these things sound like (or if they're transparent) or if they're really any better then any other DI out there but, such is life. My ears aren't tuned to be able to tell if one transformer is better than another but again, such is life. I'll just have to trust my peers on this one.
Thanks for all the replies!
Alesis Andromeda - Hammond XK3 - Moog Voyager - Moog Taurus 3 - Yamaha P90