I've read this thread and I suppose some guys here don't understand different purposes of different boxes.
First, the Radial JDI unit is the best DI-Box I've ever used. And I say about direct purpose of this kind of devices - converting an unbalanced signal to a balanced signal without any color and harm. I've made some tests when I used parallel conversion with different boxes to the one AD converter. Chains like a bass -> a bass preamp and then balanced output of this pre to AD and parallel line output via outboard DI to AD (or couple of channels of very good solid state preamps if signals too weak without it). And couple of my friends had very sad faces after I've tested they devices
Even Jensen equipped Demeter VTBP201 DI output really sucks 
Devices like REDDI are very different beasts. They saturate sound dramatically. They change it. Somebody likes this particular saturation of this particular device, somebody doesn't. So there is no fair answer. Then we use "straight" boxes, like the Radial one, we can measure differences between signals objectively. Then we use "saturation" kind of DI, like the subject of this thread, we can speak subjectively only. And we can compare them with another "saturators" only, tube DI or tube mic preamplifiers with an instrumental input.
First, the Radial JDI unit is the best DI-Box I've ever used. And I say about direct purpose of this kind of devices - converting an unbalanced signal to a balanced signal without any color and harm. I've made some tests when I used parallel conversion with different boxes to the one AD converter. Chains like a bass -> a bass preamp and then balanced output of this pre to AD and parallel line output via outboard DI to AD (or couple of channels of very good solid state preamps if signals too weak without it). And couple of my friends had very sad faces after I've tested they devices
Devices like REDDI are very different beasts. They saturate sound dramatically. They change it. Somebody likes this particular saturation of this particular device, somebody doesn't. So there is no fair answer. Then we use "straight" boxes, like the Radial one, we can measure differences between signals objectively. Then we use "saturation" kind of DI, like the subject of this thread, we can speak subjectively only. And we can compare them with another "saturators" only, tube DI or tube mic preamplifiers with an instrumental input.
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I have Eve SC408 and Yamaha HS80m.