OK, so first off, I think we need to have a big hand for all the competitors
But really, I thought all of them give you a quality DI signal that can be used to record or play bass live. But I'm sorry, you listen to the Countryman and the VT and you think that sounds pretty good until you hear the B-15 or the REDDI. The notes just sound more alive and they pop out at you. It's especially apparent when you play higher notes. A lot of times the higher notes get too plinky and banjo-like with SS DI's, but the ones with the REDDI and the B-15 have girth. Same with the VT's clean sound...the VT does a little better but that tubey push over the cliff is missing with both of them to my ears. And when you add the REDDI after the VT's distortion, it gives the top end a really nice sheen that makes it come to life in a way that always just missed when I'd run the VT by itself.
Comparing the REDDI and the B-15, it's hard for me to choose a clear favorite. Obviously, the B-15 has more tonal control, power tubes, and much more massive transformers. But the closer I got the B-15's EQ to what comes out of the REDDI, the closer they sounded to me. Again, I don't think I had it perfect, but I think I got it close, and I'm hearing pretty much equal amounts of tubey punch out of both. Also, I've heard folks talk about the "colored" sound of the REDDI, but compared to the Countryman, which has flat response up to 10k and tapers off gradually up the scale, the REDDI's voicing doesn't sound far off of that to my ears. Has way more balls and the high end is prettier, but the voicing sounds pretty neutral and usable for any situation.
The B-15 has some faint noise in the background, which I figure was because I had the volume at about 10:00, which is the point that it's toying with the idea of overdrive, or maybe some other reason caused it, don't know, don't care. You'd never notice it in a mix. I used the B-15's volume knob to set gain, and it was still kind of quiet into the computer and I had to boost it even further with my DAW's knobs. But it's all totally worth it. Listen to that tone, willya? Even with me playing it

Anyone who doesn't like that just doesn't know bass tone, sorry.
But the REDDI's copping that vibe for me in a big way, plus it's quieter and easier to work with. It's a very simple to use DI that does one thing and does it incredibly well as far as I'm concerned.
BTW, none of these pieces of gear are going away anytime soon. Even the Countryman
